A series of 1000 bit frames is to be transmitted across a data link 100 km in length at 20 Mbps. If the link has a velocity of propagation 2*10^8 m/s and BER is 2*10 ^-5, then the link utlization for
i. selective repeat with send window w=10
ii. go back n with send window w =10 is
a) 34%,46%
b)46%,20%
c)46%,34%
d)20%,46%