Suppose we are writing a jdbc program and have created objects mystat, of class statement, and myps, of class preparedstatement, with the current statement "insert into r values(1,2)". which of the following would be a valid use of one of these objects? mystat. executequery "select a where r. b-10") a) b) mystat. executequery("delete fromr") c) myps. executeupdate("delete from r") d) mystat. executequery("select * from r")