Spanning tree question

[RickPine]

I'm currently working on practice tests for the CCNA. I came across this question that has me stumped on one of the many practice tests I've done. 

Which switch becomes the root of a spanning tree for vlan20  if all links are of equal speed?

A - 24596 0018.184e.3c00

B - 28692 004a.14e5.4077

C - 32788 0022.55cf.dd00

D - 64000 0041.454d.407f

Correct answer is C. I dont get why.

The way I see it: SPT RB is selected by looking at the BID, the BID is made up of the configurable priority and MAC ID. The default priority is 32768, to this default the vlan value is added, the lowest priority wins and becomes the SPT bridge. In case of a tie on the priority, then you look at the MAC. The given question has a clear winner based on the priority switch A, because 24596 plus the 20 from the vlan equal 24616, that value is lower than any other priority on the question. Any insight would be appreciated. 

[TotallyTodd]

Hi, I think you have the correct answer but and logic but the source of your question totally may be the real issue. If this question isn't from a reputable source I would definitely recommend that you use Cisco official material to study or practice questions that have a high reputation in the community. Totally 

[Martin L]

Yes, A is correct; Often there are mistakes in answers or questions due to misprints or other errors.

24596 is the lowest value and lower priority wins before MAC is considered.  You correctly recognized the default value of 32768; one of possible answers they gave u is 32788 which includes value of 20 for vlan 20.

it seems that question is not clear; but since Bridge Priority must be in increments of 4096; legal values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864 40960 45056 49152 53248 57344 61440

Regards, ML
**Please Rate All Helpful Responses **

[MHM Cisco World · Accepted solution]

you are correct the answer must be A 
I run lab and you can see result below 

[RickPine]

Thank you all for the sanity check. I figured the question was wrong, not me. 

[Joseph W. Doherty]

Interesting that question also includes the information about all links being equal speed as that is not relevant to root election.

Link bandwidths could be relevant to you choosing which switch you want to be root, similar to consideration of topology for you selecting which switch you want as root.