_If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by$?

_If Hg is the gross or total head and hf is the head lost due to frict

1.	_If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by$?
A.	H = Hg/hf
B.	H = Hg ‚àö√≥ hf
C.	H = Hg + hf
D.	H = Hg - hf
Answer» E.