Question: What should a Mobile Station (MS) equipped for Short Message Service (SMS) do when it has previously rejected a short message due to exceeded memory capacity and then gains available memory?
Option 1: Automatically retrieve the previously rejected short message from the Short Message Service Center (SC).
Option 2: Notify the user to attempt re-sending the short message.
Option 3: Notify the network that it now has memory capacity available to receive one or more short messages.
Option 4: Delete all cached short message metadata to free up additional space.
Explanation: This is correct because, according to the specified capabilities for an MS equipped for SMS, when the MS gains memory capacity after previously rejecting a short message due to exceeded capacity, it should notify the network of its newfound ability to receive one or more short messages. This ensures the network is aware of the MS's updated status and can proceed with delivering pending messages if any.