Which of the following is not a valid identifer? mylnteger total3 mylnt return

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Among the options provided, **`return`** is **not** a valid identifier. Here's why:

1. **`mylnteger`**: 
   - Starts with a letter.
   - Contains only letters and is a valid identifier.

2. **`total3`**: 
   - Starts with a letter.
   - Contains letters and a digit, which is allowed.
   - Valid identifier.

3. **`mylnt`**: 
   - Starts with a letter.
   - Contains only letters and is a valid identifier.

4. **`return`**: 
   - **Reserved Keyword**: In many programming languages (such as Python, Java, C, and others), `return` is a reserved keyword used to exit a function and optionally pass back a value.
   - **Cannot be Used as an Identifier**: Because it's a reserved word, you cannot use `return` as a variable name, function name, or any other identifier.

**Conclusion:**  
`return` is a reserved keyword in many programming languages and therefore cannot be used as a valid identifier.

**Answer:**  
`return` is a reserved keyword and cannot be used as a valid identifier.
`return` is not a valid identifier because it's a reserved keyword in programming languages.

Which of the following is not a valid identifer? mylnteger total3 mylnt return

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