Missing info in text

Hey guys,

In example 3, q1, the text asks how the GICS measures primary business activity - assets, income or revenue. I cannot find the answer to this in the text anywhere…

It says that ICB uses revenue, but doe not mention how GICS measures it.

Are we:

a) meant to assume its the same as ICB for some arbitrary reason?

b) meant to look at sources other than the text?

c) or have I missed something?

Thanks and good luck!