Which of the following is NOT true as for the preparation of products before attending a trade show?

A、Oneshouldbeknowledgeableabouttheproducts.;
B、Oneshouldbepreparedtoanswerthevisitors’questionsabouttheproducts.;
C、Oneshouldbepreparedtomakeaproductpresentationtothepotentialcustomers.;
D、Oneshouldprepareaformalsuit.