If gcd(m,15)=1\gcd(m, 15) = 1gcd(m,15)=1 and mmm divides 30, then which of the following statements about mmm is true?
m=1m = 1m=1 only
m∈{1,2}m \in \{1, 2\}m∈{1,2}
m∈{1,2,5,10}m \in \{1, 2, 5, 10\}m∈{1,2,5,10}
mmm can be any divisor of 30