Which of the following is not a valid function name in C?Note: This question helps in clearing CoCubes test.

In C, function names must adhere to specific rules. A valid function name must start with a letter (uppercase or lowercase) or an underscore (_), followed by letters, underscores, or digits (0-9). Function names cannot include spaces, special characters (other than underscores), and cannot begin with a digit.

Now, let's analyze the options provided:

1. Valid function names: They start with a letter or underscore and contain only letters, digits, and underscores.
2. Invalid function names: These may start with a digit, contain spaces, or include forbidden characters such as punctuation marks.

Given that no specific options were provided in your question, to determine which name is not valid, simply analyze each option based on these rules. If you have specific names to check, I would be happy to confirm their validity!