Which of the following commands puts the output of the command date into the shell variable mydate?

The `$(date)` syntax performs command substitution, which executes the `date` command and captures its standard output. This output is then assigned as the value to the `mydate` shell variable.

`mydate="exec date"` would attempt to replace the current shell with the `date` command, and its output would not be captured into the `mydate` variable.

`mydate="$((date))"` uses arithmetic expansion, which is designed for evaluating mathematical expressions, not for executing commands and capturing their string output.

`mydate="date"` assigns the literal string "date" to the variable `mydate` rather than executing the `date` command and capturing its output.

`mydate="${{date}}"` is not a valid shell syntax for command substitution or variable assignment.