The first order, and the second order, partial derivatives of the following function are, respectively z= r°y² +15ye² Select one: O a. = 21 + 15e² and = 2r°y O b. - 3r+ 15 and = 2r O. = 2y + 15e² and = 21 O d. = 2r*y+ 15e² and = 21 • e. = 3r*y + 15e² and = 6zy %3D е. Cloar m y choico

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