You _____ be hungry already-you had lunch only two hours ago! [ ]

A. wouldn't

B. can't

C. mustn't

D. needn't

证券公司的自营、受托投资管理、财务顾问和投资银行等业务部门的专业人员在离开原岗位后的（）内不得从事面向社会公众开展的证券投资咨询业务。

A.1个月

B.3个月

C.6个月

D.12个月