【单选题】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.