C. Environmental Service Systems 
 
        
             
        
        
        
Answer: Transmission rate
Explanation:
  Transmission rate is measured in bits per second and it transmitted the data at the different rate across the circuit. The speed in which the data rate is transferred from one device to anther is known as transmission rate. 
The transmission rate are always less as compared to signalling rate because the signalling rate contain the total data which basically include the overhead to control the information. 
Therefore, transmission rate is the correct option. 
  
 
        
             
        
        
        
Answer:
Downloading and/or Burning it on to your computer
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Explanation:
 
        
                    
             
        
        
        
Answer:
True
Explanation:
When using databases in a project, not everyone has the same access level, e.g the database admin may have the highest level of access (access to data on live mode), the software testers have their own level of access (access to data on test mode) and so on.