With reference to C programming language, which of the following statements are correct? An identifier may start with an underscore.An identifier may end with an underscore.If is a valid identifier.The number of significant characters in and identifier is implementation dependent. Select the correct answer from the codes given below:

With reference to C programming language, which of the following state

1.	With reference to C programming language, which of the following statements are correct? An identifier may start with an underscore.An identifier may end with an underscore.If is a valid identifier.The number of significant characters in and identifier is implementation dependent. Select the correct answer from the codes given below:
A.	1 and 2 only
B.	2 and 3 only
C.	1, 2, 3 and 4
D.	3 and 4 only
Answer» D. 3 and 4 only