We are performing k$-$fold cross$-$validation on a dataset with $100,000$ rows.

I have set aside $16,000$ rows into a holdout set. I am going to perform cross$-$validation with the remaining

rows not in the holdout set. I have decided to set k to $7.$

How many rows would each of the $7$ folds have? $(1$ Point$)$

In each iteration of cross$-$validation, how many rows would the training set have and how many rows

would the validation set have? $(1$ point$)$

How does k$-$fold cross validation help ridge regression prevent overfitting? $(1$ point$)$