$3.$ Consider the following game:

Player B $$

Player A $$

Air

Sea

Land

Air

A: $3$

B: $0$

A: $0$

B: $2$

A: $7$

B: $1$

Sea

A: $4$

B: $2$

A: $6$

B: $0$

A: $0$

B: $2$

Land

A: $3$

B: $1$

A: $4$

B: $2$

A: $3$

B: $0$

a$.$ Does this game have a pure strategy Nash equilibrium? If so$,$ what is it$?$

b$.$ Find a mixed$-$strategy equilibrium for this game.

$$c$.$ This game actually has two mixed$-$strategy equilibria. Find the one you didn$$t find in part $($HINT: in one of the equilibria, one of the players plays a mixed strategy while the other plays a pure strategy$)\backslash$