Which statement about the associated potential energy function U at x = a is correct? (poll 11046046)

Which statement about the associated potential energy function U at x = a is correct?

(a) U = 0 at x = a

(b) U is a maximum at x = a.

(d) U is neither a minimum nor a maximum at x = a, and its value at x = a need not be zero.

(e) Not enough information is given to decide.

Other:

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