Final answer:
The subject of this question is Computers and Technology. It is about how an Internet Service Provider (ISP) can improve the efficiency of transmitting web documents to its clients by caching recently accessed pages.
Step-by-step explanation:
The subject of this question is Computers and Technology. Specifically, it is about how an Internet Service Provider (ISP) can improve the efficiency of transmitting web documents to its clients by caching recently accessed pages.
This means that when a client requests a web page, the ISP's server will first check if the document is already in its cache and return the cached copy if available. This helps to reduce the load on the server and improve the overall performance of the ISP.