Scientists at Lawrence Berkeley National Lab recently captured images of a Type one-A supernova in a galaxy four billion light-years away that appeared 50 times brighter than normal and in four different places in the sky. Which of the following did the scientists discover?

W) A Type-one-A supernova with a progenitor that was 20-50 times more massive than normal

X) An anomalous type-two supernova with a light curve resembling type Ia

Y) A light echo of a type-one-A supernova

Z) A type-one-A supernova whose image was strongly gravitationally lensed
Z) A TYPE-ONE-A SUPERNOVA WHOSE IMAGE WAS STRONGLY GRAVITIGNALLY LENSED