Answer:
B.
Explanation:
Computer manual is the user guide that comes along with the computer set to inform the users about the functions, ways to assemble the parts, and so on. 
The user manual consists of guide for the users specially for electronic products such as computers, refrigerators; softwares, and so on. These manuals are written by technical writers, programmers, etc. 
<u>In the given scenario the technician needs to refer to computer manual to know the meaning of the lights on the backside of the computer.</u> 
So, the correct answer is option B. 
 
        
             
        
        
        
If (sales >= 10000)
 commission = 0.2;
        
             
        
        
        
Answer:
2. <em>A reference of type A can be treated as a reference of type B</em> - False
Base class or its objects are not related to their derived class (or its objects).
Explanation:
class A {
    int a;
    public A() {
        a = 7;
    } 
}
class B extends A {
    int b;
    public B() {
        b = 8; 
    } 
}
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1. <em>After the constructor for class B executes, the variable a will have the value 7 </em>- True.
When an object of a derived class is declared, the constructor of base class is called before the constructor of derived class (is called).
3. <em>Both variables a and b are instance variables </em>- True.
Classes can have instance, or member, variables and methods.
4.<em> After the constructor for class B executes, the variable b will have the value 8</em> - True.
When object of class B is declared, its constructor was called, which initialized variable b to 8.
 
        
             
        
        
        
Answer:
B) security as a service I'm just doing the work