You are designing a plan for migrating Virtual Hard Disks （VHDs） and video files to Windows Azure Storage. The VHDs must be optimized for random read/write operation. The video files must be optimized for sequential access. You need to recommend storage types for storing the VHDs and video files. Which two storage types should you recommend？（）

A. Store VHDs in Windows Azure page blob storage.
B. Store VHDs in Windows Azure block blob storage.
C. Store video files in Windows Azure page blob storage.
D. Store video files in Windows Azure block blob storage