Which osi model layer manages data encryption?

Im doing this last minute and literally none of my neighbors or people that my dad works with use excel so if anyone could me make up an example

Apython programming question: assume s is a string of lower case characters. write a program that prints the number of times the string 'bob' occurs in s. for example, if s = 'azcbobobegghakl', then your program should print number of times bob occurs is: 2

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