== A simple yes/no question == 

 The more I read about this the more vague it becomes. I understand almost everything, but I have a simple question, that I would like to be answered only by someone who is entirely sure of the answer. 

 Will there still be an interference pattern when 
 a) There are detectors, but the data is "destroyed" before the electron arrives. 
 b) The same, but the data is destroyed after the electron has arrived, but before anyone/anything has looked at the wall. 

 I think this is a reasonable question, as it is physically testable and objective. The article states that (a) is true, but several people in the discussion apparantly don't agree. And the article states nothing about (b), but I have read other articles who make that statement. I know this isn't the place to ask questions, but I've already done alot of research about this and I'm lost in an endless sea of contradiction. I would just like to know the answer without devoting my life to it. Certainly because it's such a simple and objective yes/no question.  
 Greetings,