no man, another example is programming:
C++ is compatible with C (C++ understands C syntax)
C is not compatible with C++ (C doesnt understand C++ syntax).
I'm actually going to assume they are asking something different and say B... If C is correct then D is also correct because v3 is compatible with v2 and v1. When a router is configured with v3 it can process v1 and v2 requests, but a router configured for v1 or v2 cannot process a v3 request. Therefore, v3 is only compatible with v3. The question is definitely worded poorly and needs more context.
if v3 is compatible with v2, then doesn't this imply that v2 is in some way able to work with v3, so it's too compatible with v3? seems like a stupid question. the only good answer is C though, so i agree with that.
It's not exact but is the best answer because other options are false. IGMP V3 is compatible with V1 and V2 (and obvious V3), likewise, IGMP V2 is compatible with V1 (and obvious with V3). Finally, IGMP V1 is only compatible with V1.
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