Question: Gradients wrt what - If C is the cost function, x is the input, y is the output, W and b are weights and biases

Gradients wrt what - If C is the cost function, x is the input, y is the output, W and b are weights and biases of neurons respectively, which of the following are the gradients used in gradient descent?
Gradients of C wrt. x
Gradients of C wrt y
Gradients of C wrt W and b
All of the above
None of the above
Gradients wrt what - If C is the cost function, x

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