Standing Waves Exist in a String of Length L That $\lambda$

Standing waves exist in a string of length L that is fixed at one end and free at the other.The speed of the waves on the string is v.The three lowest frequencies of vibration are

A) v/4L,v/2L,and 3v/4L
B) v/2L,v/L,and 3v/2L
C) $\lambda$ /4, $\lambda$ /2,and 3 $\lambda$ /4
D) v/4L,3v/4L,and 5v/4L
E) $\lambda$ /3,2 $\lambda$ /3,and 3 $\lambda$ /3