The plane is defined by at least 3 points which are not on the same line. It can also be defined by line and a dot that doesnt belong to that line. Finaly, we can mark already existing plane with just a letter on it (without any points).
T isnt answer because that is a point
Z is answer. There is no point around Z which means that is how plane is named.
ZXV is not answer because Z is not a point so it cannot be placed next to points to define something.
LTX is not answer because they are on same line.
