Logical operation!

Question

Hey guys! I want to know that in C programming or C++ question is :

Which of the following is true ?
A. 1
B. 66
C. .1
D. -1
E. All of the above

You can go this URL https://www.cprogramming.com/tutorial/c/quiz//quiz2.html for more detail about this question.

Answer 1

Anything which is not 0 and not false is true.

Answer 2

I think the answer is A i.e. 1 as 1 means true and can be used inside if statement.

Answer 3

It means, correct answer is E. All of the above. Am I right ?