If a molecule is known to have a trigonal bipyramidal shape such that "M" is the central atom and "L" is each of the five substituents, which of the following statements is NOT true about this particular molecule?

W) It has a 3-fold rotation axis

X) It has at least two mirror planes

Y) It has an inversion center

Z) It has at least one improper rotation possible
Y) IT HAS AN INVERSION CENTER