In levelling operation,
(A) The first sight on any change point is a back sight
(B) The second sight on any change point is a fore sight
(C) The line commences with a fore sight and closes with a back sight
(D) The line commences with a back sight and closes with a foresight
(A) The first sight on any change point is a back sight
(B) The second sight on any change point is a fore sight
(C) The line commences with a fore sight and closes with a back sight
(D) The line commences with a back sight and closes with a foresight