Let vectors A⃗ =(2,1,−4), B⃗ =(−3,0,1), and C⃗ =(−1,−1,2). Which of the following can be computed?

Let vectors A⃗ =(2,1,−4), B⃗ =(−3,0,1), and C⃗ =(−1,−1,2).
Which of the following can be computed?
A⃗ ⋅B⃗ ⋅C⃗
A⃗ ⋅(B⃗ ⋅C⃗ )
A⃗ ⋅(B⃗ +C⃗ )
3⋅A⃗

The answer is :

A⃗ ⋅(B⃗ +C⃗ )

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