Answer:
D
Explanation:
All three of A, B and C are required to harden a host. Thus, All of the above makes the best option.
Hardening simply refers to making your data impossible to be penetrated. More like bulletproof. 
To do this, ensure measures like 
- Regular Program cleanup 
- Patches management 
- service pack installation 
- service or usage policies
...among others.
Cheers 
 
        
             
        
        
        
Answer:
23 ,21,10,63,13
Explanation:
We have to convert binary to decimal 
10111 corresponding decimal number is

10101 corresponding decimal number is

01010 corresponding decimal number is

111111 corresponding decimal number is

001111 corresponding decimal number is

 
        
             
        
        
        
FutureSmart focuses on the important Middle School years by empowering students to become the stewards of their financial futures. This three hour web-based resource educates students on the practicalities of daily financial decisions and the payoffs of long-term planning. Since Middle School is an important period for positive habits
to take form and grow, this course is particularly meaningful.
Through a compelling narrative in which students play the Mayor of a town, local citizens are helped with real-life decisions. From weighing opportunity costs, to delaying instant gratification for long- term gain, students face important questions on their way to becoming FutureSmart. At the end of the course, students compose their own blueprint for the future. FutureSmart c
        
             
        
        
        
Answer:
C
Explanation:
I believe this is because you cannot represent the number sixteen with only four binary bits. The highest you can go is 15.