An endpoint registration request message that is sent to a SIP Server contains the following two options1:

E.164 address: This is the telephone number of the endpoint, which is used to identify the endpoint in the SIP domain. The E.164 address is also known as the Address of Record (AOR), which is a high-level name that is assigned to a SIP entity without regard to the device or devices that name might use. The format for an AOR is sip:user@domain (e.g. 2025551234@sip.plivo.com)2.

SIP URI: This is the location of the endpoint, which is identified by an IP address, port number and protocol. The SIP URI is used to reach the endpoint for establishing a media session. Theformat for a SIP URI is sip:user@host:port;transport (e.g. sip:2025551234@192.168.1.120:5060;udp)1.

The other options are not correct because:

SIP Server IP address: This is not included in the endpoint registration request message, as the endpoint already knows the IP address of the SIP Server to which it is sending the message. The SIP Server IP address is usually configured in the endpoint settings as the Registration Domain or the Outbound Proxy3.

Endpoint IP address: This is not included in the endpoint registration request message, as it is already part of the SIP URI. The endpoint IP address is the host part of the SIP URI, which indicates the location of the endpoint1.

E.164URI: This is not a valid option, as there is no such thing as an E.164URI. The E.164 address is not a URI, but a telephone number that is used to identify the endpoint in the SIP domain2.

References := 1: Cisco Unified Communications System 9.0 SRND - SIP Infrastructure 2: SIP signalling- the registration process and setting up a SIP call 3: Programmable Voice - SIP Registration | Twilio