1.ThenameofaJavasourcefile(a)hasnorestrictions(b)mustbethesameastheclassitdefines,ignoringcase(c)mustusetheextension.class(d)mustbethesameastheclassitdefines,respectingcase2.Whichofthefollowingstatementsis(are)trueabouttheuseofanasterisk(*)inaJavaimportstatement?Ⅰ.