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?…

`TCP_NODELAY` is a valid socket option used to disable the Nagle algorithm, which can improve response times for small packets by sending them immediately.

`SO_NOBROADCAST` is not a standard Samba `socket options` parameter value; it is generally used with broadcast sockets to prevent them from sending packets to the broadcast address.

`SO_TXBUF` is not a standard Samba `socket options` parameter value; `SO_SNDBUF` or `SO_RCVBUF` are used for setting send/receive buffer sizes, but not typically directly configured via `socket options` in smb.conf with `SO_TXBUF`.

`IPTOS_LOWDELAY` is a valid IP Type Of Service (TOS) option that can be set on sockets to prioritize low-latency traffic, which is beneficial for interactive services.

`SO_KEEPALIVE` is a valid socket option that enables the periodic transmission of keep-alive messages to detect dead peers and prevent idle connections from being dropped by network devices.