; or (ii) less than one quarter of the registered positions initially allocated for the 6-month period remain available after the first month. (B) Condition met If a condition referred to in clause (i) or (ii) of subparagraph (A) is met, any remaining registered positions shall be available for any registered employer. (i) Portability (1) Nonimmigrant portability An H–2C nonimmigrant who is employed in a registered position may— (A) be employed at any worksite if the registered employer advertised such location under subsection (e)(2)(B)(i)(I) or (f)(3)(B)(iii); (B) terminate such employment at any time, for any reason; and (C) seek and accept employment with another registered employer in any other registered position within the terms and conditions of the H–2C nonimmigrant visa. (2) Employer portability A registered employer who employs an H–2C nonimmigrant may— (A) employ such nonimmigrant at any worksite if the registered employer advertised such location under subsection (e)(2)(B)(i)(I) or (f)(3)(B)(iii); (B) terminate such employment at any time for any reason if such reason is lawful for United States workers