4.1 Caesar's Cipher (3-pt) Caesar's cipher is a very simple encrypting scheme where each letter is shifted down by a fixed number from its position in the alphabet. For example, if the given character set is the English alphabet in upper case and the shift number is 3, then each letter in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" from the plain text will be replaced by "DEFGHIJKLMNOPQRSTUVWXYZABC", respectively, in the cipher text. Now in this exercise, your character set (alphabet) is the concatenation of all uppercase and lowercase letters: const string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; You're given two cipher text strings as the following- "UIFZBOLTBSFBMTP10PXobTuIFCSPOYCPNCFST" "dBFTBSdJQIFSEYFSDJTFXJUIdqMVTqMVT" You're also given the condition that the corresponding plain text of the first cipher text of the above contains the string "Yanks". Write a C++ program to figure out the shift number then decipher and print out the plain text for both, from your program. 4.2 A library record class with derived classes for books and CDs (5-pt) The ItemRecord class maintains books and other media records for a library. Its attributes include the title(string), price(double), rating(char: 'A'-'D' in descending popularity). The operations include: 1. a constructor that takes default values ("placeholder", 0.99, 'D'), and checks for invariants (negative price, invalid rating letters, etc) 2. individual getters that return the item's title, price, and rating 3. overloaded