A. In SIFT, you can draw both the keypoints and the descriptor vectors. When you use the drawKeypoints function in OpenCV to visualize the keypoints, you can pass an additional parameter flag to control the appearance of the keypoints. Setting the flags parameter to cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS will draw the keypoints with the size and orientation of the keypoint, as well as the descriptor vector as an arrow pointing in the direction of the keypoint orientation.