The factorisation of a(x + y +z) + b(x + y + z) + c(x + y + z)
is . a. (xy + yz + xz)(a + b + c)
b. (ab + bc + ac)(x + y + z)
c. (x + y + z)(a + b + c)
d. (a + b + c)(2x + 2y + 2z)

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