Use the Fact Situation in Q13 to Answer the Related

Use the fact situation in Q13 to answer the related question that follows. Assume that A and B have a unanimous shareholder agreement,which provides that at any time,a shareholder can serve a notice on the other shareholder to buy the other's shares for fair market value.If A and B could not resolve their impasse,then

A) B could serve this notice on A.
B) A could serve this notice on B.
C) if B served this notice on A first,A would have to sell his shares in the company to B at fair market value,
D) if A served the notice on B first,B would have to sell his shares in the company to A for fair market value.
E) all of the above