Consider the following statements:

Modify the weight vector in the direction of the gradient after each iteration.

In gradient decent, choose a non$-$variable learning rate.

Modify the weight vector in the direction of the negative gradient after each iteration.

In gradient decent, each update of the weight vector depends on all the training examples

Which among statements above are true with respect to gradient descent?

Option A: $1$ and $2$

Option B: $3$ and $4$

Option C: $2,3,$ and $4$

Option D: None of them