Consider a Vigenere cipher that uses the following rule: C;= (pi+kimod m) mod 26, where cp, kand m are the cipher text, plain text, key, and the key-length respectively. Assuming that the plain text is "attackatdawn" and the key is "kite" what are the cipher text characters corresponding to the four "a's" in the plain text? Use the following encoding scheme: abcdefghijklmnopqrst u v w x y z 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 O 1. y,m,n, v O 2. k, e, t, i 0 3.kr, z, h 4. a,b,c,d