Your network contains an Active Directory domain named contoso.com. The domain contains a 
server named Server1. Server1 runs Windows Server 2012 R2 and has the Hyper-V server role 
installed. On Server1， you create and start a virtual machine named VM1. VM1 is configured as 
shown in the following table. 

You plan to create a snapshot of VM1. You need to recommend a solution to minimize the amount 
of disk space used for the snapshot of VM1. 
What should you do before you create the snapshot？（）