Given these variable assignments, what is the correct way to use the fgets$()$ function?

$filename $=$ "students.txt$"$;

$students $=$ fopen filename, $"r$;

$students $=$ fgets$($$filename$)$;

fgets$($$filename, $students$)$;

$student $=$ fgets$($$students$)$;

fgets$($$students, $"$r$")$;