Clause 2-17: Option for Increased Quantity is used when the contract gives the option quantity as a percentage of the basic contract quantity or as an additional quantity of a specific line item.
Clause 2-18: Option Item is used when the contract identifies the option quantity as a separately priced line item having the same name as a corresponding basic-contract line item.
Clause 2-20: Option to Renew (with Preliminary Notice) is used to provide for continuing performance of the contract beyond its original term and it is necessary to include in the contract a requirement that the Postal Service will give the supplier a preliminary written notice of its intent to extend the contract.