A Fore Sight (F.S.) is also called-

Correct option is A

Fore Sight (F.S.), also known as Minus Sight (-S), refers to the reading taken at the final station in leveling.
(b) Plus Sight is taken at a benchmark or turning point to establish height.
(c) Intermediate Sight is any reading between F.S. and B.S.
(d) Turning Point refers to the point where leveling shifts to a new instrument station.