Final answer:
To connect a mobile device to GPS, no specific option is required as GPS is satellite-based and only needs a clear line of sight to receive signals. A wireless access point may be needed for applications that use GPS data for maps.
Step-by-step explanation:
To connect a mobile device to GPS (Global Positioning System), none of the options listed such as a data link cable, infrared, Bluetooth, or a wireless access point, are specifically required. GPS is a satellite-based navigation system and mobile devices typically have built-in GPS receivers. To receive GPS signals, the device only needs to have a clear line of sight to the sky, where the GPS satellites orbiting the Earth transmit the necessary signals that the device can use for location tracking and navigational purposes. However, software applications on the device that make use of GPS data for maps or navigation might require an internet connection to download map data, which could involve a wireless access point, but this is for downloading additional data, not for the actual GPS connection.