As per the below furnished document, the answer seems to be option A -> 3.
It looks the question is slightly a tricky one. Default multiplier value of BFD basic configuration seems to be 3. In 15.2 release, Changed default multiplier from 3 to 7.
BFD App-Router multiplier range is 1-6, with default value as 6.
Please refer to : https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/sdwan-cr-book/config-cmd.html#r_shaping_rate_3056.xml
The BFD Multiplier Default Value is 6. the range is from 1-6 as per Cisco white papers.
Answer D
Reference:-
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/sdwan-cr-book/config-cmd.html#r_shaping_rate_3056.xml
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