A query has grouped patients by state of residence. Each group should display the number of male patients A value of $\text{'}2\text{'}$ in the column SEX$\_$C means male. What SQL expression returns the number of male patients per group?

ONE OF THE FOLLOWING $(2$ PTS$)$

CASE WHEN SEX$\_$C $=\text{'}2\text{'}$ THEN SUM$(1)$ ELSE O END

$3.$ CASE WHEN SEX$\_$C $=\text{'}2\text{'}$ THEN COUNT $(1)$ ELSE $0$ END

C$.$ SUM$($ CASE WHEN SEX$\_$C $=\text{'}2\text{'}$ THEN $1$ ELSE $0$ END $)$

D$.$ COUNT$($ CASE WHEN SEX$\_$C $=\text{'}2\text{'}$ THEN $1$ ELSE $0$ END$)$