Expand (2a-3b+4c) ^2...

Expand `(2a-3b+4c) ^2`

A

`4a^2-9b^2+16c^2`-12ab-24bc+16ac`

B

`4a^2+9b^2+16c^2`-12ab+24bc -16ac`

C

`4a^2-9b^2-16c^2-12ab-24bc+16ac`

D

`4a^2+9b^2+16c^2-12ab-24bc+16ac`

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