Answer:
Random Sampling
Explanation:
Random Sampling technique is being used in the given scenario. 
 
        
             
        
        
        
Answer:
the answer is D Smart Object
 
        
                    
             
        
        
        
A) Records of the dates and quantities of refrigerant recovered and recycled are unnecessary
        
                    
             
        
        
        
Answer:
The answer to the given question is "dumb terminal".
Explanation:
In the mainframe computers, a dumb terminal is an output device that is used to accept data from the central processing unit (CPU). In the compression, the small terminal is a screen that is used to provides bold and blinking characters that have its own processor.   
That's why the answer to this question is "dumb terminal".
 
        
             
        
        
        
Answer:
1940 – 1956: First Generation – Vacuum Tubes. These early computers used vacuum tubes as circuitry and magnetic drums for memory. ... 
1956 – 1963: Second Generation – Transistors. ... 
1964 – 1971: Third Generation – Integrated Circuits. 1972 – 2010: Fourth Generation – Microprocessors.