Question: Upon receiving an `Int_Error` message, what action does the MSC (Mobile Switching Center) or SGSN (Serving GPRS Support Node) take if the default SMS Handling parameter in MO-SMS-CSI is set to 'releaseTransaction'?
Option 1: Continue processing without CAMEL support and modify SM parameters transparently.
Option 2: Send an `A_RP_ERROR` message to another network element (e.g., HLR) and hold resources for further instructions.
Option 3: Initiate a new CAMEL_O_SMS_INIT procedure with revised parameters to circumvent the error.
Option 4: Send an `A_RP_ERROR` message to the MS (Mobile Station) and then release all resources, ending the CAMEL_O_SMS_INIT procedure.
Explanation: When the MSC or SGSN receives an `Int_Error` and the default SMS handling is set to 'releaseTransaction', it responds by notifying the Mobile Station of the error with an `A_RP_ERROR` message. Following this, it releases all allocated resources and terminates the ongoing CAMEL_O_SMS_INIT procedure, as this setting prioritizes transaction release upon encountering errors over continued processing or alternative handling.