Answer :
3com is a valid identifier. An identifier is a sequence of letters, digits, and underscores, with no whitespaces and must start with a letter or an underscore.
In computer programming, an identifier is a name given to a variable, function, class, module, or other entity in the source code of a program. It is used to identify and refer to the entity within the code. An identifier must follow specific naming conventions, which vary between programming languages, but some common rules include:
Must start with a letter or underscore
Can only contain letters, digits, and underscores
Cannot contain whitespaces
Cannot be a reserved word or keyword in the programming language
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Final answer:
In the context of programming, a valid identifier is a name that is used to identify a variable, function, or any other user-defined item. Following the established rules, the only valid identifier in your list is option (d) dollar$. This starts with a letter and contains a special character usually acceptable in most programming languages.
Explanation:
In the field of programming, a valid identifier is a name used to identify a variable, function, or any other user-defined item. According to the general rules for creating identifiers in most programming languages, valid identifiers must begin with a letter (A-Z, a-z) or an underscore (_), followed by any combination of alphabets, digits (0-9), or underscores. They must not contain spaces or special characters, and should not begin with a digit.So, of your options, (d) dollar$ is the only valid identifier. This is because it starts with a letter and contains a special character that is usually accepted in most programming languages such as JavaScript, C, and C++.
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