I feel hopeless on this problem. Please help me solve this question and break it down for me so I can understand how to solve them.

IPV4 was the first publicly used Internet Protocol. It uses 4-byte addresses which permits 252 distinct values. The typical format for an IPV4 address is A.B.C.D where A, B, C, and D are all decimal integers in the inclusive range between 0 and 255. The lengths of A, B, C, and D cannot be larger than 3. In the past, a leading zero signaled that the value rather than decimal format. In 2005, the IETF came out with a draft regarding IP addressing stating that addresses should only be in dotted decimal notation: octal has not been fully adopted. In this exercise, a leading zero is allowed, but only if the value it precedes is