The Standing Waves on a String of Length L That $\lambda$

Multiple Choice

The standing waves on a string of length L that is fixed at both ends have a speed v.The three lowest frequencies of vibration are

A) v/L,2v/L,and 3v/L
B) v/2L,v/L,and 3v/2L
C) $\lambda$ /2, $\lambda$ ,and 3 $\lambda$ /2
D) L/v,2L/v,and 3L/v
E) $\lambda$ /3,2 $\lambda$ /3,and 3 $\lambda$ /3