The response times on a Samba server are gradually increasing, so it is decided to experiment with various socket options in smb.conf. Which of the following are valid values for this parameter? (Choo

TCP_NODELAY is a valid socket option that disables the Nagle algorithm, allowing small packets to be sent immediately without waiting for more data, which can reduce latency.

SO_NOBROADCAST is not typically listed as a direct valid string value for Samba's `socket options` parameter; while `SO_BROADCAST` is, `SO_NOBROADCAST` as a negative flag is not commonly configured via this parameter's string list.

SO_TXBUF is not a standard or documented valid socket option name for Samba's `socket options` parameter; `SO_SNDBUF` is the correct standard name for setting the send buffer size, but even that is typically a value with a size, not just a flag.

IPTOS_LOWDELAY is a valid socket option that sets the IP Type-of-Service header to prioritize low delay, which can improve response times for interactive traffic.

SO_KEEPALIVE is a valid socket option that enables the periodic transmission of keep-alive messages to detect if a connection is still active, helping manage idle connections and potentially improving perceived responsiveness.