$8)$ Which of these is NOT a rule for using product positioning as a strategy$-$implementation tool?A$)$ Look for the hole or vacant niche, a segment of the market currently not being served.B$)$ Do not serve two segments with the same strategy.C$)$ Position yourself in the middle of the map, if you are one of only two competitors.D$)$ Position yourself in the middle of the map, if there are more than two competitors.E$)$ All of these are rules for using product positioning as a strategy$-$implementation tool.