I got the question:

a, b and c are three vectors such that c is perpendicular to both a and b. What is the value of a × b × c?

a. (1, 1, 1)

b. (0, 0, 0)

c. (1, 1, 0)

d. (0, 0, 1)

can someone explain what this question is looking for? I have no idea what the answers even represent. It seems like there should be more information in this question to me