Exam 300-710 topic 1 question 140 discussion

This is an example of RMA'd process, unregistering the faulty kind of easy pick here. But it is not the first to consideration in real scenario when RMA'd an HA FTD. Need to retain first the faulty FTD for back restoration purposes. You can register the new device first using different IP. ..

Taking as reference the steps to Replace a Primary FTD HA Unit from cisco (https://www.cisco.com/c/en/us/td/docs/security/firepower/601/configuration/guide/fpmc-config-guide-v601/fpmc-config-guide-v601_chapter_01100110.pdf) page 21. The right answer is D. Unregister the faulty Cisco FTD device from the Cisco FMC. Step 1 Choose Force Break to separate the high availability pair; see Separate Units in a High Availability Pair, on page 22. The break operation removes all the configuration related to HA from Firepower Threat Defense and Firepower Management Center, and you need to recreate it manually later. To successfully configure the same HA pair, ensure that you save the IPs, MAC addresses, and monitoring configuration of all the interfaces/subinterfaces prior to executing the HA break operation. Note Step 2 Unregister the failed primary Firepower Threat Defense device from the Firepower Management Center; see Deleting Devices from the Firepower Management Center. Step 3 Register the replacement Firepower Threat Defense to the Firepower Management Center; see Add Devices to the Firepower Management Center

Only D makes sense

unregistering is the only logical option

It should be D why A?

It's D. A makes no sense.