Question: What type of SRVCC handover is supported in MR-DC configurations?
Option 1: Handover of IMS video bearer to UTRAN
Option 2: Handover of IMS voice bearer to GERAN
Option 3: Handover of IMS voice bearer to UTRAN
Option 4: Handover of IMS data bearer to UTRAN
Explanation: According to the supported MR-DC handover scenarios, only SRVCC handover of IMS voice bearer to UTRAN is supported. This indicates that among the given options, handover of IMS voice bearer to UTRAN is the correct answer.