The best and most correct answer among the choices provided by your question is the first choice or letter A. The answer is 6.
Since:
a = 2
b = 7
Substituting the values to the expression:
F(a=2,b=7) = 4a^4 − 2b^2 + 40 = 4(2)^4 - 2(7)^2 + 40 = 6
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