The correct answer is C. Identifier.
An identifier is a name that is used to refer to a variable, function, class, or other entity in a computer program. Identifiers are typically made up of letters, numbers, and underscores, and they must begin with a letter.
A variable name is a type of identifier that is used to refer to a variable. Variable names are typically used to store data, and they can be changed throughout the execution of a program.
Option A, Vname, is not a valid term in computer programming.
Option B, Alterable, is a characteristic of some identifiers, but it is not the only characteristic that defines an identifier. For example, the identifier “main” is used to refer to the main function in a C program, but it is not alterable.
Option D, Uniform, is not a characteristic of identifiers. Identifiers can be any length, and they can contain any combination of letters, numbers, and underscores.