Digital Logic - Boolean Algebra

Let X be a 3-variable Boolean function that produces output as '1' when at least two of the input variables are '1'. Which of the following statement(s) is/are CORRECT, where a, b, c, d, e are Boolean variables?

Which of the following Boolean algebraic equation(s) is/are CORRECT?

For a Boolean variable x, which of the following statements is/are FALSE?

Consider a Boolean expression given by F(X, Y, Z) = ∑(3,5,6,7). Which of the following statements is/are CORRECT?

If w, x, y, z are Boolean variables, then which one of the following is INCORRECT?