If d=gcd(a,b)d = \gcd(a, b)d=gcd(a,b), which statement must be TRUE?
If ccc is any common divisor of aaa and bbb, then c∣dc | dc∣d
If c∣dc | dc∣d, then c∣ac | ac∣a and c∣bc | bc∣b
Both (a) and (b)
Neither (a) nor (b)