$1.$ Charlie needs to write a conditional statement to test if a file exists and if it is$,$ in fact a file. Which of the lines of code do this?

Group of answer choices

if $[-$e file$]$

if $[-$f file $]$

if $[-$d file $]$

if $[-$x file $]$

$2.$ Elliot would like his script to return a value of $2$ if the script fails. Which statement does this?

Group of answer choices

#$!$

while

$$1$

exit

$3.$ Joey wants his script, myscript, to run for the next $4$ days at noon which is the best deferred schedule command for this?

Group of answer choices

for i in $\{1.\mathrm{.}4\}$ do at noon $<$ myscript

at noon $+4$ days