Answer:
trackball
Explanation:
A trackball can be seen on a mouse. 
 
        
             
        
        
        
Answer:
C. &&
Explanation:
Of the options provided:
A) ++ : increment operator. For example : ++1 = 2
B) || : Logical OR operator. A || B is true if any one of A or B is true.
C) && : Logical AND operator. A && B is true if both A and B are true.
A            B         A && B
False    False      False
False    True       False
True     False      False
True     True        True
D) @ : Ampersand character (commonly used in email addresses) e.g, [email protected]
 
        
             
        
        
        
Crime rate
unemployment
fluctuations
suspension of terrorism