Which of the following is a valid variable name in Python?

In Python, variable names must follow certain rules. They must start with a letter (a-z, A-Z) or an underscore (_), followed by letters, numbers, or underscores. They cannot start with a number, contain spaces, or use special characters other than underscores.

The variable name variable_name is valid because it follows these rules, starting with a letter and including only letters and underscores. For instance:

variable_name = 10

Using meaningful and descriptive variable names helps make your code more readable and easier to understand. It’s a best practice to choose variable names that clearly indicate what the variable represents, making the code more maintainable.

Variable names are case-sensitive in Python, so Variable_Name and variable_name would be considered different variables.