challenge: What are the three possible scenarios considered for the disk in WISEA J120037.79-784508.3?
  
  A. A disk with uniform density, a disk with a gap, and a disk with varying temperature
  B. A single blackbody disk, a disk with a gap, and a disk with varying density
  C. A single blackbody disk, a disk with uniform density, and a power-law disk
  D. A blackbody disk, two blackbody disks, and a power-law disk
  Answer: 