question: When a Beacon frame is received with macAutoRequest set to FALSE, how are the PAN descriptors sent to the higher layer? [IEEE 802.15.4] option 1: Sent as part of the MLME-SCAN.confirm option 2: Sent separately as MLME-BEACON-NOTIFY.indication primitives option 3: Sent in the MLME-BEACON-NOTIFY.indication primitive together with a null PANDescriptorList option 4: Sent in the MLME-BEACON-NOTIFY.indication primitive with the Beacon frame option 5: Sent in the MLME-SCAN.confirm with the Beacon frame 