(4) For purposes of this subsection: (A) The term “area of employment” means the area within normal commuting distance of the worksite or physical location where the work of the H–1B nonimmigrant is or will be performed. If such worksite or location is within a Metropolitan Statistical Area, any place within such area is deemed to be within the area of employment. (B) In the case of an application with respect to one or more H–1B nonimmigrants by an employer, the employer is considered to “displace” a United States worker from a job if the employer lays off the worker from a job that is essentially the equivalent of the job for which the nonimmigrant or nonimmigrants is or are sought. A job shall not be considered to be essentially equivalent of another job unless it involves essentially the same responsibilities, was held by a United States worker with substantially equivalent qualifications and experience, and is located in the same area of employment as the other job. (C) The term “H–1B nonimmigrant” means an alien admitted or provided status as a nonimmigrant described in section 1101(a)(15)(H)(i)(b) of this title . (D) (i) The term “lays off”, with respect to a worker— (I) means to cause the worker’s loss of employment, other than through a discharge for inadequate performance, violation of workplace rules, cause, voluntary departure, voluntary retirement, or the expiration of a grant or contract (other than a temporary employment contract entered into in order to evade a condition described in subparagraph (E) or (F) of paragraph (1)); but (II) does not include any situation in which the worker is offered, as an alternative to such loss of employment, a similar employment opportunity with the same employer (or, in the case of a placement of a worker with another employer under paragraph (1)(F), with either employer described in such paragraph) at equivalent or higher compensation and benefits than the position from which the employee was discharged, regardless of whether or not the employee accepts the offer. (ii) Nothing in this subparagraph is intended to limit an employee’s rights under a collective bargaining agreement or other employment contract. (E) The term “United States worker” means an employee who— (i) is a citizen or national of the United States; or (ii) is an alien who is lawfully admitted for permanent residence, is admitted as a refugee under section 1157 of this title , is granted asylum under section 1158 of this title , or is an immigrant otherwise authorized, by this chapter or by the Attorney General, to be employed.