$($a$)$ What are$/$is the differences between symmetric and asymmetric encryption schemes?

$($b$)$ Assuming Alice $($sender$)$ and Bob $($sender$)$ are communicating to each other using a public$-$private encryption scheme, explain the steps to send an encrypted file from Alice to Bob. $($you can show this with a simple illustration, if needed$).$

$($c$)$ List and briefly define three uses of a public$-$key crypto system.

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