What does "business end" mean?

[Rita]

Test No. incompl/inter-53 "Business Expressions (2)", question 8

This is the really important part of the machine and that's why we call it the business ..........

(a) centre
(b) end
(c) area
(d) point

Test No. incompl/inter-53 "Business Expressions (2)", answer 8

This is the really important part of the machine and that's why we call it the business end.

Correct answer: (b) end

Your answer was: n/a
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What does it mean * Business end*
Many thanks dears teachers
Rita

[Alan]

The important part.
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English as a Second Language
You can read my ESL story Too Many Words