Read the text and determine if the sentence is true (see options at the end):

How to hang a muffler<br>Purchase a new muffler hanger. Also called muffler straps, muffler hangers are thick rubber loops. Your exhaust system may require more than 1 hanger, so look underneath the car to see if it requires any additional muffler hangers.

Sentence: muffler hanger has been used by bob
Possible answers:
 --Yes.
 --It's impossible to say.
 --No.
It's impossible to say