What will the following code output: var x; x = 5; var y = x;

Which of the following is a valid identifier name?

A). var

B). 123abc

C). _123abc

D). #abc123

Are JavaScript identifiers case-sensitive?

A). Yes

B). No

C). Only in ES6

D). Only in strict mode

Can an identifier be a single character?

A). Yes

B). No

C). Only in ES5

D). Only in ES6

What is the maximum length of an identifier?

A). 255 characters

B). 31 characters

C). 64 characters

D). No limit

What will be the result of using a reserved word as an identifier?

A). No error

B). Syntax error

C). Logical error

D). Runtime error

Which identifier is valid in strict mode?

A). public

B). _public

C). 123public

D). public$

Which is a correct identifier for a variable?

A). 9variable

B). variable-9

C). variable_9

D). variable 9

Can identifiers start with a digit in JavaScript?

A). Yes

B). No

C). Only in ES5

D). Only in strict mode

Which of the following is a valid identifier?

A). if

B). else

C). null

D). value1

What is a valid identifier in JavaScript?

A). 123abc

B). abc123

C). let

D). var