Answer:- Major property of a good hash code is that objects which are equal should return the same hash code .
Explanation: Hash codes is a numeric value which  is used for identify a object while a equality testing .Hash code can occupy the value of any length and then returns a fixed length value. The value of hash codes are variable. 
If two objects are equal then by the method of equal(object) if the hashcode() function is called on both the objects , they produce the same value.
 
        
             
        
        
        
Answer:
The answer is "Option D".
Explanation:
A system or a group of components that communicate with your environment through the sharing of resources, materials, and knowledge with a view to system regeneration and development is known as an Open system. In other words, we can say that it is a system that includes a non-proprietary hardware and advert-based software which enables third parties to add or interact with products to plug in the system and It is freely available on the internet. In this question, the incorrect options can be described as follows:
- In option A, The management system is used by an organization. It is a paid system that's why it is not correct.
 
- In option B, This system enables users in online communities and evaluates one another that's why it is not correct.
 
- In option C, This type of system provides resources for upgrade user knowledge. It is a paid system that's why it is not correct.  
 
 
        
             
        
        
        
Answer:
a reverse chronological journaling site.
Explanation:
A blog originally known as weblog, is an online journal containing informational or educational content, it usually displays information from the last added item ( that is why it is called reverse chronological journaling site), it can be personal or for a corporate entity for promoting brand identity.
 
        
             
        
        
        
Word processing software may be used to create, edit, save, and print documents, among other things. Text within a document may be copied, pasted, moved, and deleted. Text formatting includes font selection, bolding, underlining, and italicizing.