On January 1, 2011, Ronan and David enter into a 10-year agency agreement, where David is to act as Ronan's agent in purchasing rare coins at auctions. On January 2, 2021, David is at an auction, and a very rare coin comes up for bid. David tries to reach Ronan but cannot. Should David buy the coin as Ronan's agent? Oa No, David has no authority to act on Ronan's behalf O b Yes, David has the express authority to act on Ronan's behalf. OC No. The purchase would be prohibited by the doctrine of laches. Od Yes, David has the apparent authority to act on Ronan's behalf