In DES, Let k1 = 00000000090416 andR0 = 0000808016 be the inputs of thef-Function, find the output as follows:
a. Find the expansion E(R0).
b. Find E(R0) XOR k1.
c. Find the substitution S(E(R0) XORk1)
d. Apply the permutation P(S(E(R0) XORk1)).