You are creating a custom tile set by using Microsoft MapCruncher. The tile set must overlay a weather map image in a Virtual Earth 6.0 application by using MapCruncher. You need to perform two tasks before using MapCruncher to create the custom tile set. Which two tasks should you perform? (Each correct answer presents part of the solution. Choose two.)

A.
Split the weather map image into tiles.

B.
Obtain the latitude and longitude coordinates for the corners of the weather map image.

C.
Apply the proper alpha filter to the weather map image to display any transparent portions on the Virtual Earth map.

D.
Obtain low resolution weather map images for low zoom levels and high resolution weather map images for high zoom levels.