Select all true statements about the greatest common factor and least common multiple of the given numbers.

A. The greatest common factor of 50 and 75 is 25.

B. The greatest common factor of 36 and 54 is 9

C. The greatest common factor of 20 and 40 is 40.

D. The least common multiple of 5 and 9 is 45

E. The least common multiple of 4 and 6

Answer:a. is trueb. is truec. is falsed. truee. 24