Which of the following would being back all first names beginning with $$K$?$

Which of the following would being back all first names beginning with $$K$?$

Select $*$ from student where firstname like $$K$\%$

Select $*$ from student where firstname like $$K$*$

Select $*$ from student where firstname like $$K$?$

Select $*$ from student where firstname $=$K$*$