The correct approach involves either changing the default compute/zone property to europe-west2-b before creating the second instance or specifying the zone directly in the create command for the second instance. The first option (A) would create both instances in europe-west2-a because it doesn't change the default zone or specify a different zone for the second instance. Option D and E attempt to change the default zone but use incorrect syntax (zone instead of compute/zone in D and configuration set instead of config set in E). Options B and C correctly address the requirement by either updating the default zone to europe-west2-b before creating the second instance (B) or specifying europe-west2-b as the zone for the second instance directly in the create command (C).