Answer: [1, 0, 0, 0, 0, 0, 0], [0, 0, 0, 1, 0, 0, 1]

A sparse vector is characterized by having most of its elements as zero. The correct examples are: - **B. [1, 0, 0, 0, 0, 0, 0]**: This vector contains only one non-zero element, qualifying it as sparse. - **D. [0, 0, 0, 1, 0, 0, 1]**: With just two non-zero elements, this vector also meets the criteria for being sparse.

Author: LeetQuiz Editorial Team