This a unilateral right in a contract, for a specific period of time, where the government may elect to purchase additional supplies or services called for by the contract, or extend the period of performance:

This a unilateral right in a contract, for a specific period of time, where the Government may elect to purchase additional supplies or services called for by the contract, or extend the period of performance: An Option

Explanation:

Option to be used in:

It is in the Government's soundest curiosities. There is a requirement for assistance exceeding the initial period. There is a requirement for the progression of aid.

Options are not in the Government's soundest curiosities when:

The foreseeable provisions involve the least economic scale measures and offering terms notably adequately into the future to allow the competing acquisition, generation, and distribution. The contractor will acquire the illegal risk

Not to use options:

Demand rates are anticipated to vary considerably. The option describes identified fixed numbers for which supplies are available