The statements regarding oxyacids of phosphorous are
I) `HPO_(3)` molecule is monobasic acid
II) `H_(4)P_(2)O_(6)` molecule has P-P bond
III) `H_(4)P_(2)O_(7)` molecule has P-O-P linkage
The correct combination is
A. All are correct
B. Only II is correct
C. II & III are correct
D. I and II are correct
