An administrator needs to lower the amount of new TCP connections to help with network congest. How should the administrator accomplish this?

HTTP keep-alive instructs both client and server to leave a TCP connection open after a transaction completes, allowing subsequent HTTP requests to reuse that connection instead of performing a new three-way handshake each time. This directly reduces the rate of new TCP connection establishment, which is the primary source of connection-related congestion. It is the standard mechanism for reducing TCP connection churn in HTTP environments.

Increasing the TCP receive window allows more unacknowledged data to be in flight, improving throughput, but it has no effect on the number of new TCP connections being created.

Delayed ACKs reduce the frequency of acknowledgment packets sent per connection but do not prevent or reduce the establishment of new TCP connections.

An indefinite timeout keeps idle connections open longer but does not limit or reduce the creation of new connections and can exhaust server resources.