Declarations and Initializations - Programming

Q1:

Which of the following correctly represents a long double constant?

A 6.68

B 6.68L

C 6.68f

D 6.68LF

ANS:B - 6.68L

6.68 is double.
6.68L is long double constant.
6.68f is float constant.
6.68LF is not allowed in c.