Can I have answer and explanation?

2. Consider a dataset that you wish to apply a model to, with the goal of measuring the prediction accuracy of your model (e.g. a classication problem). (a) Give one advantage of using cross-validation in this context. (b) Give a brief description of how a dataset is partitioned when carrying out crossvalidation. (c) What does the K in K-fold cross-validation stand for? (i.e. explain its signicance)