Bean Processor Inc. agrees to ship a certain quantity of coffee beans to Coffee Caf$$ LLC$.$ Bean sends to Coffee an e$-$mail indicating that the parties intended to form a contract. Against Bean, as a contract, the $I^{\text{m}\text{a}\text{i}\text{l}\text{w}\text{i}\text{l}\text{l}be\text{s}\text{u}\text{f}\text{f}\text{i}\text{c}\text{i}\text{e}\text{n}\text{t}}$

a$)$ if Coffee responds with an acknowledgment of the deal.

b$)$ under no circumstances.

c$)$ if it is signed by Bean.

d$)$ if it is signed by Coffee.