(A) for services for an employer (other than the United States or any agency thereof)— (i) performed by a citizen of the United States if, at the time of the payment of such remuneration, it is reasonable to believe that such remuneration will be excluded from gross income under section 911, or (ii) performed in a foreign country or in a possession of the United States by such a citizen if, at the time of the payment of such remuneration, the employer is required by the law of any foreign country or possession of the United States to withhold income tax upon such remuneration,
(B) for services for an employer (other than the United States or any agency thereof) performed by a citizen of the United States within a possession of the United States (other than Puerto Rico), if it is reasonable to believe that at least 80 percent of the remuneration to be paid to the employee by such employer during the calendar year will be for such services,
(C) for services for an employer (other than the United States or any agency thereof) performed by a citizen of the United States within Puerto Rico, if it is reasonable to believe that during the entire calendar year the employee will be a bona fide resident of Puerto Rico, or
(D) for services for the United States (or any agency thereof) performed by a citizen of the United States within a possession of the United States to the extent the United States (or such agency) withholds taxes on such remuneration pursuant to an agreement with such possession,