Which of the following variable name formats would be problematic if used in the majority of data software programs?

While trailing underscores might be unusual, "First_Name_" typically adheres to naming conventions that allow underscores and would be accepted by most software.

"FirstName" uses camel case and contains no problematic characters, making it a commonly accepted and robust variable naming convention.

"First_Name" uses snake case and contains no problematic characters, making it a widely accepted and robust variable naming convention.

Variable names with spaces, such as "First Name", are generally problematic in most data software programs and programming languages because spaces can be interpreted as delimiters or cause syntax errors, often requiring special escaping or quoting.