If 2 masses m1 and m2 are connected by the ends of a spring and are made to oscillate then the time period is
A - Directly proportional to √(m1 + m2)
B - Directly proportional to √(m1 - m2)
C - Inversely proportional to √(m1 + m2)
D - Inversely proportional to √(m1 - m2)