Can we draw the following hypothesis from the context (see options)? 

Context:

How to use adjustable objective rifle scopes<br>Be sure that your scope is mounted properly. Sighting-in can have been done preliminarily, but additional sighting-in will be desirable after following these steps : Know your rifle. There are actually two optical systems in a rifle scope.

Hypothesis: A scope needs to have lens covers while moving. 
Select from:
 1). Yes.
 2). It's impossible to say.
 3). No.
2).