Answer:
LED  is the correct answer for the following question.  
Explanation:
LED is a display that is used in the Laptop screen which is a type of blacklight technology. Blacklight technology is a technology that is used to increase readability when the light is low.
An LED display is used in a modern laptop. It is a flat panel display. Its brightness is so high and allows a user to use it in the presence of the sunlight. It is designed in 1962 for the first time.
The above question asked about a blacklight technology that is used in a laptop device which is the LED display used in a modern laptop. Hence the answer is LED 
 
        
             
        
        
        
Answer:
#include <bits/stdc++.h>
using namespace std;
void funct(){
    string name;
    cout<<"enter the string: ";
    cin>>name;
    
     reverse(name.begin(), name.end());
     cout<<"The string is : "<<name<<endl;
    
}
int main()
{
    funct();
   
   return 0;
}
Explanation:
create the function funct() with return type void and declare the variable type string and print a message for asking to used enter the string.  
The string enter by user is store in the variable using cin instruction.
after that, we use a inbuilt function reverse() which takes two argument.
firs argument tell the starting point and second index tell the ending point. then, the reverse function reverse the string.
name.begin() it is a function which return the pointer of first character of string.
name.end()  it is a function which return the pointer of last character of the string.
finally, print the reverse string.
for calling the function, we have to create the main function and then call the function. 
 
        
             
        
        
        
Answer:
You must attach the database files
Explanation:
 
        
             
        
        
        
Answer:
Most displays in current use employ cathode ray tube ( CRT ) technology similar to that used in most television sets. The CRT technology requires a certain distance from the beam projection device to the screen in order to function.
 
        
             
        
        
        
A
because if you leave certain metals in the rain they tarnish or rust. think about how if you leave a bike in the rain for too long it will start to rust on the metal parts