The correct answer is B. Only one refresh will run at a time .

Failover groups can be refreshed on a schedule to replicate supported account objects and database objects to target accounts. Snowflake does not run overlapping refresh operations for the same failover group.

Why B is correct:

If a scheduled refresh is still running, Snowflake does not start another concurrent refresh for the same failover group. Refresh operations are managed so that only one refresh runs at a time.

Why the other options are incorrect:

A. Multiple refreshes for the same failover group do not run concurrently.

C. Refreshes still require the appropriate privileges and configured replication/failover group permissions.

D. A delayed or long-running refresh does not mean the next refresh is automatically canceled in the way stated. The key behavior is that refreshes do not overlap.

Official Snowflake documentation reference:

Snowflake documentation for replication and failover groups explains that scheduled refreshes are managed by Snowflake and that refresh operations do not run concurrently for the same group.