Choose from options: Determine if the sentence is true based on the text below:
It is easy to adjust rainbird speakers.

How to adjust rainbird sprinklers<br>Set the fixed left edge on the sprinkler head. Before you adjust the watering direction or distance, you will need to set the starting point for the water rotation. Find the center cap on the rotor case.
Available choices: a. Yes; b. It's impossible to say; c. No;
b.