Question

Identify the invalid identifier -
(a) fundamental (b) funda_mental (d) none of the above (c) fundamental
pls answer as fast as you can ​

Answer 1

Explanation:- Identifier cannot start with a digit; it cannot have a space and case is a keyword

Answer 2

d) none of the above is the answer.

Explanation: All the mentioned names are valid names for identifiers.  

The rules of naming an identifier are as follows:

• An identifier must start with an alphabet
• An identifier name can be alphanumeric.

• An identifier must not contain special symbols, white spaces, blank spaces between its name.

• An identifier should not start with a digit.
• An identifier may contain an underscore.