I think the answer is wrong on this question as the real answer is not present:
https://community.spiceworks.com/questions/4357/explanation?source=superfeed-daily-challenge
The real answer I believe is 1310/1550nm
So now I am faced with the choice of which wrong answer do I pick.
@david-k-spiceworks
@suzanne-spiceworks
I have answered it and flagged.
7 Spice ups
Nice catch, @briser !
@suzanne-spiceworks I got the same question this morning - it now shows 1550, but 1300 is not changed to 1310.
3 Spice ups