Answer:
You should install a personal firewall, a program that protects your computer from unauthorized access by blocking certain types of communications.
Explanation:
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.
 
        
             
        
        
        
use an anchor tag(<a>This is an anchor tag</a>) and use the href attribute and set it's destination to the section element who's id or class is "sisters".
Example:
<a href="#Sisters">Click Here!</a>
then you can add this somewhere on the document.
<section id="Sisters">Hello World!</section>
 
        
             
        
        
        
Answer:
What????
What does that mean??????????????????????????????????
 
        
             
        
        
        
Hello there! Your answer would be A.
GUIs are Graphical user interfaces. Command prompts are unique to Windows operators, so your best option would be A since the question covers most GUIs. 
Hope this helps, have a great day!
 
        
             
        
        
        
Answer:
the indexOf() method
Explanation:
The indexOf() method in java returns the first occurrence of the of the string or a character specified in it.It can be used to search both a character or a string.
for example:-
import java.util.*;
import java.lang.*;
import java.io.*;
class indexOf
{
 public static void main (String[] args)
 {
     String s="IamNumber4";
     int l=s.indexOf("Num");//using indexOf() method on string object..
     System.out.println(l);
 }
}
Output:-
3