Home » Programming Language (coding) » Python MCQs » Which of the following is an invalid variable?Which of the following is an invalid variable? Mr. Answer Which of the following is an invalid variable? A. foo B. my_string_1 C. 1st_string D. _ Correct Answer: Option C. 1st_string Take Part in Discussion: Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment. Solve : * 23 + 9 =