In ______Systems, Capacity Should Be Set at the Level of ______

In ______systems, capacity should be set at the level of ______, while in ______ systems, capacity should be set at the level of ______.
high-contact; peak demand; low-contact; average demand
low-contact; peak demand; high-contact; average demand
low-contact; peak demand; low-contact; average demand
high-contact; average demand; high-contact; peak demand
None of these