V:The Boolean function $f$ is given as follows with the don't cares shown

${\displaystyle \underset{m}{\overset{?}{}}}(0,1,6,7)+{\displaystyle \underset{d}{\overset{?}{}}}(3,5)=f(A,B,C)$

$?$We would like to design this function using just one logic gate. What is this gate

AND $.$a

NAND $.$b

XNOR $.$c

NOR $.$d