Which of the following is an example of a function whose graph in the $xy-$ plane has no intercepts ?

Question

$\begin{array}{1 1} (a)\;\text{A linear function whose rate of change is not zero} \\ (b)\; \text{A quadratic function with real zeros} \\ (c)\; \text{A quadratic function with no real zeros} \\ (d)\; \text{A cubic polynomial with at least one real zero} \end{array}$