Which of the following is a valid variable name: 1centplace, total marks, student_name, class set name?

Here's why:

• 1_cent_place: Invalid because variable names cannot start with a number.
• total marks: Invalid because variable names cannot contain spaces.
• student_name: Valid because it starts with a letter and contains only letters and underscores.
• class set name: Invalid because variable names cannot contain spaces.