QUESTIONS ON THEORY OF MACHINES

Q-The number of instantaneous centers of rotation in a slider-crank quick return mechanism is 
1-10
2-8
3-6
4-4

Q-A planer mechanism has 10 links& 12 rotary joints. Using Kutchback's criterion ,the number of degree of freedom of mechanism is 
a-1
b-3
c-2
d-4