For each of the following vector fields ** F **, decide whether it is
conservative or not by computing the appropriate first order partial derivatives. Type in a potential function
f (that is, [math]

A. [math]

[math]

B. [math]

[math]

C. [math]

[math]

Note: Your answers should be either expressions of x and y (e.g. "3xy + 2y"), or the letter "N"

Your overall score for this problem is