Which of the following commands in R will filter the dataset ACS $($used in class and located on the RStudio Server$),$ choosing only the male observations from the variable sex?

subset$($ACS$,$ sex$==$"male"$)$

summary$($ACS$,$ sex$==$"male"$)$

subset$($ACS$,$ sex$=$male$)$

summary$($ACS$,$ sex$=$male$)$