关于跖疣的特征，错误的是（）

A.是发生于足跖部的扁平疣

B.皮疹可一个或多个

C.皮疹表面粗糙不平，质地硬

D.自觉明显触压痛

E.病程慢性，可自然消退

While working on an external project your customer asks you to perform some additional tasks that are not included in the formal contract．You should （）.

A．honor the customer's request as sign of cooperation to ensure future business

B．refuse the request and report the customer to your sponsor

C．acknowledge the request and advise the customer to submit a formal change request

D．convene a meeting of the project team and rewrite the scope statement