The ability of the united states to respond rapidly with appropriate options to potential or actual crisis contributed to regional stability. thus, often may be planned and executed as crisis response or limited-contingency operations.

A joint operation

Explanation:

The given sentence is in relation to the Crisis response and Limited Contingency Operations. The sentence represents the instructions and general procedure during a general crises and explains the contingency plans. In this regards, the sentence focuses on the response of the U.S. forces to ensure regional stability during a potential or actual crisis. It is recommended to carry a joint operation as a crisis response in collaboration with local agencies and civil support.

the 4th option is the answer

answer; by working independently, the states have a high likelihood of developing innovative solutions that can be employed in other states;