4) The following was generated using a mono alphabetic cipher. Use what you have learned about cryptanalysis using letter frequencies to decrypt this cipher text Tell us the key that was used. (You can write a computer program to solve this, or you can solve it by hand) Hints: (May be relevant or not) a. As you know, the most frequently occurring letter in English is e. Therefore, the first or second (or perhaps third?) most common character in the message is likely to stand for e. Also, e is often seen in pairs (e.g., meet, fleet, speed, seen, been, agree, etc.). Try to find a character in the ciphertext that decodes to e. b. The most common word in English is the. Use this fact to guess the characters that stand for t and h. ztmn pxtne cfa peqef kecnp cjt tmn zcwsenp ontmjsw ztnws tf wsvp xtfwvfefw, c feb fcwvtf, xtfxevqea vf gvoenwk, cfa aeavxcwea wt wse rntrtpvwvtf wscw cgg lef cne xnecwea eymcg