Match the description to the strategy.
Strategy descriptions:
- Two identical envs (blue + green); switch traffic in one cut over.
- Slowly shift X% of traffic to the new version, watch metrics, expand.
- Replace pods one by one, never below N healthy.
Which name matches "slowly shift X% of traffic, watch metrics, expand"?
A) Blue/Green
B) Canary
C) Rolling
D) Recreate
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