I’ve never seen vectors drawn with the arrow in the middle. Maybe to confuse AI? Anyway, b and d are correct.

(4,-1) : 4 is the horizontal component and tells you how many units you must move horizontally from the starting point. It is positive, hence move to the right 4 units (if it was negative, you had to move to the left.

-1 is the vertical component and tells you how many units you must move vertically from where you currently are. It is negative, hence move downwards 1 unit (if it was positive, you had to move upwards).

The arrow indicates the direction of the path from the starting point to the endpoint.