Question: Select the command(s) that behave identically to the following command: mv "$obj" ~/Files/"$usr"_"$obj"

Question

Question: Select the command(s) that behave identically to the following command:   mv    "$obj"     ~/Files/"$usr"_"$obj"

Accepted Answer

b.  mv    "$obj"     ~/Files/${usr}_"$obj"

Answer

a.  mv    "$obj"   ~/Files/$usr_"$obj"

Answer

c.  mv   "$obj"     ~/Files/{$usr}_"$obj"

Answer

d.  mv   "$obj"     ~/Files/'$usr'_"$obj"

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