Describing logos

This task is about intepreting meaning from a business logo.
Companies and other organisations often have logos - a small graphic design that shows something about the company. The logos below show what particular companies sell or do.
 
Logo for Audio and Security Specialists  
a)  "Audio and Security Specialists" sell car stereos and car alarms. How do the lines coming out of the "D" on the logo help show this
 
 
 
 
 
 
Logo for The Gentle Dental Centre
b)  "The Gentle Dental Centre" cares for teeth. How does the logo design help show this?
 
 
 
 
 
Logo for Miramar Dental Health Centre
c)  "Miramar Dental Health Centre" is another place that cares for teeth. How does the logo design help show this?
 
 
 
 
 
Logo for Mana Transport
d)  "Mana Transport" helps people move house. How does the arrow on the logo help show this?