Pick up the correct statement from the following:
The area of a sloping surface of a protective embankment of mean height d, side slopes S : 1 and length L is
If B is the width of formation, d is the height of the embankment, side slope S : 1, for a highway with no transverse slope, the area of cross-section is
The correct prismoidal formula for volume is
If B is the width of formation, d is the height of the embankment, side slope S : 1, for a highway with no transverse slope, the area of cross-section is