In what way diffraction from each slit related to interference pattern in a double slit experiment?

Question

$\begin{array}{1 1} \text{The inference pattern will be modified by the diffraction pattern from either of the two slits } \\ \text{The inference pattern will be modified by the diffraction pattern from each of the two slits } \\ \text{The inference pattern will not be modified by the diffraction pattern from the two slits } \\ \text{None of the above } \end{array}$