In order to create a customized presale$$ presentation, the first thing salespeople need is to$\_\_\_\_\_\_\_\_.$

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Part $1$

A$.$

enlist the help of their senior sales management

B$.$

think about appropriate products that will be a fit for the client

C$.$

rehearse their presentation

D$.$

collect background information

E$.$

make sure senior management signs off on the preapproach tactics