A communication system for binary$-$coded decimal $($BCD$)$ codes uses even parity for error detection. Assume the sender wants to send the two numbers: $9$ and $7.$ Then, the sender transmits:

$($Note: In this communication system, the parity bit is padded$/$added for every transmitted BCD digit$)$

a$.{11001}_{00111}{?}_{?}$

b$.{10010111}_{?}$

c$.{110010111}_{?}$

d$.{01001}_{10111}{?}_{?}$

e$.{01001}_{0111}{?}_{?}$