If a number is an element of the set of real numbers, which of the following statements
must also be true?
A) The number is an element of either the
set of rational numbers or the set of
irrational numbers.
B) The number is an element of both the
set of rational numbers and the set of
irrational numbers.
C) The number is an element of the set
of rational numbers but not the set of
irrational numbers.
D) The number is an element of the set of
irrational numbers but not the set of
rational numbers.