Shell sort: subarrays .Please showing working out and explanation. Thank you!

3. Consider Shell sort where we apply insertion sort to k subarrays (or columns) for k= 3 and k= 2. For a particular k, we say that the array is k-sorted if each of the k subarrays, as obtained/defined in the context of Shell sort, is sorted properly. The l-th subarray, with 0