1. A rational number is defined as a number that can be expressed in the form \( \dfrac{p}{q} \), where \(p\) and \(q\) are integers and
(a) \(q = 0\)
(b) \(q = 1\)
(c) \(q \neq 1\)
(d) \(q \neq 0\)
By definition, a rational number is \( \dfrac{p}{q} \), where \(p, q\) are integers and \(q \neq 0\).