Game tree for a $2$ player sequential game. If P$1$ picks up and P$2$ picks up$,$ P$1$ gets $73$ and P$2$ gets $2.$ If P$1$ picks up and P$2$ picks down, P$1$ gets $75$ and P$2$ gets $1.$ If P$1$ picks down and P$2$ picks up$,$ P$1$ gets $56$ and P$2$ gets $56.$ If P$1$ picks down and P$2$ picks down, P$1$ gets $124$ and P$2$ gets $28.$

In the game show above, is$/$are the sub$-$game perfect Nash equilibrium efficient?

Multiple equilibrium, all efficient

Multiple equilibrium, some efficient but some inefficient

Multiple equilibrium, all inefficient

Single equilibrium, efficient

Single equilibrium, inefficient

No equilibrium