Which of the following is an invalid statement?

A. abc = 1,000,000

B. a b c = 1000 2000 3000

C. a,b,c = 1000, 2000, 3000

D. a_b_c = 1,000,000

Correct Answer is :

B. a b c = 1000 2000 3000

Explanation

Spaces are not allowed in variable names.