A fixed mass ' $m$ ' of a gas is subjected to transormation of states from $K$ to $L$ to $M$ to $N$ and back to $K$ as shown$Image$
$1.$ The succeeding operations that enable this transformation of states are
$(A)$ Heating, cooling, heating, cooling
$(B)$ Cooling, heating, cooling, heating
$(C)$ Heating, cooling, cooling, heating
$(D)$ Cooling, heating, heating, cooling
$2.$ The pair of isochoric processes among the transormation of states is
$(A)$ $K$ to $L$ and $L$ to $M$
$(B)$ $L$ to $M$ and $N$ to $K$
$(C)$ $L$ to $M$ and $M$ to $N$
$(D)$ $M$ to $N$ and $N$ to $K$
Give the answer question $1$ and $2.$
