Kenneth,

I can understand that point. I am not going to say that you are wrong but I will offer my interpretation of the question and how I answered.

I took enabled to mean 'activated'. Answer 3 will merely set the configuration but it's not technically active (enabled) until you execute the reconfigure statement or restart the server.

Following that logic I chose answer 1. The question does leave it up to your interpretation of the word.

Cheers