Misprint in the exam

It seems that there is a misprint in the exam problem just below the last circuit and above 2g) it is stated that

arg(¦Å) = arg(z) - ¦Ð/2

I was informed that some students have to choose instead

arg(¦Å) = arg(z) + ¦Ð/2

to get the stated result. I also now get this, and I believe I found the mistake in my original calculation, so I think the correct choice is 

arg(¦Å) = arg(z) + ¦Ð/2

In case some disagree, please tell me.

Joakim