VOL2 TS1

Guys,

I was doing the VOL2 TS1 when I've seen the question below :

Resolve the problem preventing R4 from reaching SW2 over the shortestpath

R4 couldn't reach SW4 and be ospf neighbor , because the dead interval was different. 

On R4 was non-default " dead-interval 41" 

I fixed the problem  just adding the same dead interval on SW4, but when I checked the answer, the workbook have fixed taking off the dead interval from R4 and make the default timers.

So, my question is, It could be a problem on the LAB Exam ? I fixed using the one way and the answer is different, but its working.