resource pool to hold heavier loads?

Which of the following types of scalability is for distributed systems to expand and contract its
resource pool to hold heavier loads?

A.
Functional

B.
Load

C.
Administrative

D.
Geographic

Explanation:
Scalability is the ability of a system, network, or process, which handles growing amount of work in a capable regular method or its ability to be enlarged to hold that growth. Scalability can be deliberated in various dimensions/ways:
Administrative scalability: This type of scalability is used for increasing the number of organizations to share and enlarge a single distributed system. Functional scalability: This type of scalability is used to improve the system by inserting new functionality at least effort.
Geographic scalability: This type of scalability is used to maintain the performance, usability. Load scalability: This type of scalability is for distributed systems to expand and contract its resource pool to hold heavier loads.