Which two actions should a consultant take before importing a large volume of data into an NPSP org?

Which two actions should a consultant take before importing a large volume of data into an NPSP org?
A . Check the code coverage of the target org
B. Disable certain Apex classes manually in production
C. Check if the data is clean, structured, and in its final format
D. Disable certain Apex classes using TDTM

Answer: C,D