What are the purposes of your dining out with your clients?①.You may dine in a restaurant with a new customer giving him a warm reception.②.You may dine out with your client to release the nerves of both parties when your negotiation with him went into dead end.③.You may dine out with your client to celebrate the concluding of the contract after hard negotiation between the two parties.④.The ultimate goal of business dining is to pave the way to further business cooperation.
选项：

A: ①②③
B: ①②④
C: ②③④
D: ①②③④