a) mltiplication<T> f(a1, a2);
b) add<T> f(a1, a2);
c) subtract<T> f(a1, a2);
d) plus<T> f(a1, a2);
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a) mltiplication<T> f(a1, a2);
b) add<T> f(a1, a2);
c) subtract<T> f(a1, a2);
d) plus<T> f(a1, a2);
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d
Explanation: plus f(a1, a2); is one of the correct in-built functor available.