In the context of network application architectures, what does "self$-$scalability" refer to$?$

Question $62$ options:

The capacity of data centers to grow without additional costs

The client's ability to handle multiple connections simultaneously

The ability of servers to handle increasing loads by adding more clients

The peer's ability to function without a network connection

The capability of an architecture to increase service capacity as more peers join

The decentralized nature of data storage and management

The server's ability to maintain performance under heavy request loads