Q$1)$ choose the suitable answer?

$1-$IV in play fair security is

$2-$ Random number b$-$secure for connection c$-$privacy d$-$none of all

$2-$ DES cyber has many round using

a$-$ IV b$-$IV and key c$-$Key d$-$counter

$3-$ The CDC and OFD needs to

a$-$ Key b$-$Sbox c$-$IV and sbox and key d$-$none of all

$4$ the counter is

a$-$ and b$-$Or c$-$XOR d$-$none of all

$5-$ all round cyber takes

a$-14$ round b$-12$ round c$-8$ round d$-16$ round