${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_i\text{n}\text{v}\text{o}\text{l}\text{v}\text{e}\text{s}\text{p}\text{u}\text{t}\text{t}\text{i}\text{n}\text{g}an\text{i}\text{d}\text{e}\text{a}\text{i}\text{n}\text{t}\text{o}\text{w}\text{o}\text{r}\text{d}\text{s}or\text{i}\text{m}\text{a}\text{g}\text{e}\text{s}\text{.}}$

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Part $1$

$A.$

Decoding

$B.$

Responding

$C.$

Retrieving

$D.$

Transmitting

$E.$

Encod