Network migration typically includes the followingphases:

Preparation Phase:

Network survey

Migration plan design

Backup

Pre-configuration

Middle Phase (Migration Execution):

On-site monitoring

Migration implementation

Service test (to verify the migration effect)

Post-Migration Phase:

Optimization

Documentation

Final acceptance

Hence,Migration preparationis part of theinitial phase, not themiddle phase.

Correct answer: A. Migration preparation