To solve this problem, we need to analyze both the Assertion (A) and the Reason (R) given in the question.$\\$Assertion (A):$\\$In a particular point defect, an ionic solid is electrically neutral, even if a few of its cations are missing from its unit cells.$\\$Reason (R):$\\$In an ionic solid, Frenkel defect arises due to the dislocation of cation from its lattice site to an interstitial site, maintaining overall electrical neutrality.$\\$Let's analyze each statement:$\\$• Assertion (A) is describing a situation where an ionic solid remains electrically neutral despite the absence of some cations. This is possible in a Schottky defect, where equal numbers of cations and anions are missing, maintaining electrical neutrality.