The Military's Former Policy of "Don't Ask, Don't Tell" (DADT)

The military's former policy of "don't ask, don't tell" (DADT) was eliminated in 2011. Legally, what was defective about the law?

A) DADT was based on stereotypes and required people to lie about themselves, which did not stand up in many court cases.
B) There were never any injured heterosexual parties, whom the law was intended to protect.
C) Outside of courts martial, DADT could stand up in civilian courts.
D) The law became obsolete because the military's leaders as well as its members did not agree with it.