The mpclient command is the designated utility for interacting with the Multi-Portal (MOP) daemon on a Check Point Security Gateway. The getdata action retrieves the current configuration for a specific portal service managed by MOP. The internal service name for the Mobile Access Portal is sslvpn. Therefore, executing mpclient getdata sslvpn in expert mode directly queries the MOP daemon and returns detailed configuration information, including the dynamically assigned TCP port on which the Mobile Access Portal is listening.

B. netstat -nap | grep mobile shows active network listeners but does not specifically query the Multi-Portal configuration to find the assigned port; it's a general-purpose network tool.

C. netstat getdata sslvpn is an invalid command. The netstat utility does not have a getdata argument; this incorrectly combines syntax from two different commands.

D. mpclient getdata mobi is incorrect because mobi is not the valid internal service name for the Mobile Access Portal. The correct service identifier is sslvpn.

1. Check Point Support Center, sk60372: "Multi-Portal (MOP) on Gaia OS". In the "Commands" section, under "To get the current configuration of a specific portal", the article explicitly lists the command syntax as mpclient getdata and specifies sslvpn as the portal name for the Mobile Access Portal.

2. Check Point R81.10 CLI Reference Guide, Page 511. This guide describes the mpclient utility as the "Multi-Portal client utility," confirming it is the correct tool for managing and querying the Multi-Portal service from the command line.