Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively : <br>

Question

https://clay6.com/mpaimg/729_a.jpg

( A ) $g, g$
( B ) $\frac{g}{3},\frac{g}{3}$
( C ) $ g, \frac{g}{3}$
( D ) $\frac{g}{3}, g$