When North Korea Invaded South Korea in 1950

When North Korea invaded South Korea in 1950:

A) Congress declared war before President Truman could formally request it
B) Truman asked for a declaration of war and received one
C) Truman asked for a declaration of war and was rebuffed
D) Truman sent American troops to Korea without asking for a declaration of war
E) Truman did not immediately send American troops to Korea because the Supreme Court ruled that it would be an unconstitutional use of presidential power