Which statement regarding operations with Rational and Irrational numbers is true?

a.
The sum of two Irrational numbers
is always Rational

c. The product of a Rational number and
Irrational number could be either
Rational or Irrational.

b. The product of two Irrational
numbers is always Rational

d. The sum of a Rational number and
Irrational number is always Irrational