Answer:
Electronic mail is a method of exchanging messages between people using electronic devices. Email entered limited use in the 1960s, but users could only send to users of the same computer, and some early email systems required the author and the recipient to both be online simultaneously, similar to instant messaging.
 
        
             
        
        
        
Answer:
DiffServ (Differentiated Service)
Explanation:
DiffServ (Differentiated Service) field is used to prioritize traffic in IPv4 packet. 
DiffServ is used as QoS (quality of service) on networks at Layer 3, replacing former IPv4 TOS field to effectively deal with the web traffic and prioritization issues starting from 1998. 
 
        
             
        
        
        
It does not work that way....I thought the same thing. The sound will always come out of your iPhone
        
             
        
        
        
therefore the frequency = 6×10^14
 
        
             
        
        
        
Answer:
a. select show all comments on the review tab
Explanation:
Please mark me brainliest if correct