What is the significance of the expression ( f(1+h)-f(1) )/h in the following graph of f when h is 9/3

The answer is as follows:

The significance of the expression ( f(1+h)-f(1) )/h in the following graph of f when h is 9/3 is that:

The slope of a line through P and U

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Hello there. there.

Please help! what is the significance of the expression ( f(1+h)-f(1) )/h in the following graph of f when h is 9/3

 slope of a line through P and U

Iam not sure but i think the answer is b