Answer:
Option a: Trojan
Explanation:
A Trojan or Trojan horse is one of the computer malware that exist in computing world. Trojan often appears as a legitimate software to deceive user to activate it by social engineering. Once the Trojan is activated in the user computer, a hacker can remote control the infected computer for malicious purposes such as removing files, sending files, displaying message or rebooting computer. 
However, Trojan cannot be replicated in the infected computer.
 
        
                    
             
        
        
        
One risk might be that they might use copyright music and and the music creator might take legal action. 
 
        
             
        
        
        
Answer:
cooperate society
Explanation:
A cooperative society is a voluntary association that started with the aim of the service of its members.
 
        
             
        
        
        
Answer:
<em>platform as a service (PaaS)</em>
Explanation:
Platform as a Service (PaaS) <em>is a cloud services system in which a third-party vendor offers hardware and software services</em> – usually the ones required for the production of applications – to internet users. 
The hardware and software are managed by a PaaS company on its own network.
As more of a consequence, PaaS helps users to access in-house technology for designing or running a new app.