Define an RP-tree by the parent-child adjacency lists as follows:(i) Root B: J, H, K; (ii) J: P, Q, R; (iii) Q: S, T; (iv) K: L, M, N.The preorder vertex sequence of this tree is

• A. B, J, P, Q, S, T, R, H, K, L, M, N.
• B. B, J, H, K, P, Q, R, L, M, N, S, T.
• C. B, J, Q, P, S, T, R, H, L, M, N, K
• D. B, J, P, Q, S, T, R, H, L, M, N, K.