What could you use to formal 123456789 to format of social security number 123-456-789?

What could you use to formal 123456789 to format of social security number 123-456-789?

A.
@STRCAT ()

B.
@STEXT ()

C.
@strext () and @strcat ()

D.
@STRFIND ( )

Explanation:
Reference:
http://download.oracle.com/docs/cd/E15881_01/doc.104/gg_wux_ref_v104.pdf