True or False :

1. When implementing the dual-index policy, the order-up-to level of the fast supplier is compared against the on-hand inventory.

2. When sourcing from a supplier from with a longer lead time, the order-up-to level should become larger

3. Firms should choose either on-shore or off-shore, but not both.

4. Under the tailored base-surge policy, an increase of the slow supplier's lead time leads to a reduced order to the slow supplier.

5. Dual sourcing from two suppliers with the same cost and different lead time always generates a higher profit than single sourcing from either of the suppliers.