Currency Management Question!

[iamMichael]

End of Chapter Question in Reading 18 in the CFAI textbook.
Question 1!
How are we suppose to know if the USD or the GBP is domestic or foreign currency?

 

[ArBe]

Because it’s given in the text? “Analyze the movement of the USD against the foreign ccy for Portfolio A.”
And it’s mentioned that performance of the portfolio is measured in USD.