Consider the following grammar for describing meeting times that can be given by either time values or intervals. The rules for the nonterminal time are not important here; assume that the Haskell type Time represents specific time values. mtg::= at time from time to time Which of the following data type definitions for Mtg are a correct representation of the abstract syntax for the mtg grammar? data Mtg = From Time Time At Time data Mtg = Time | From Time Time data Mtg = At Time | From Time Time data Mtg = From Time Time | At Time Time