Null values are a problem because they are ambiguous

Which of the following constraints represents the assignment for task 2, scanning?

A) X2A + X2B + X2C = 0 B) X2A + X2B + X2C = 1 C) X2A + X2B + X2C ? 1 D) X2A + X2B + X2C ? 0

Exchanges have become one of the most popular types of Net marketplace because they encourage competitive bidding that drives prices down

Indicate whether the statement is true or false