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Select the INCORRECT statement...

Select the INCORRECT statement

A

`x_(1)x_(2)+x_(1)x_(3)+x_(2)x_(4)+x_(3)x_(4)=1`

B

`x_(1)x_(2)+x_(1)x_(3)+x_(2)x_(4)+x_(3)x_(4)=0`

C

`x_(2)^(3)+x_(4)^(3)=18`

D

`x_(2)^(3)+x_(4)^(3)=27`

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