Consider the following statement: such that ^2 = 2. Which of the following are equivalent ways of expressing this statement? (Circle the letter for each that is equivalent to the given statement.)

a. The square of each real number is 2.

b. Some real numbers have a square of 2.

c. The number has square 2, for some real number .

d. If is a real number, then ^2 = 2.

e. Some real number has square 2.

f. There is at least one real number whose square is 2.