Use Interfaces when… - You see that something in your design will change frequently. - If various implementations only share method signatures then it is better to use Interfaces. - You need some classes to use some methods which you don't want to be included in the class, then you go for the interface, which makes it easy to just implement and make use of the methods defined in the interface.   Use Abstract Class when… - If various implementations are of the same kind and use common behavior or status then abstract class is better to use. - When you want to provide a generalized form of abstraction and leave the implementation task with the inheriting subclass. - Abstract classes are an excellent way to create planned inheritance hierarchies. They're also a good choice for nonleaf classes in class hierarchies.

Answer: B) 5 Explanation: Sum of numbers in all individual boxes must be equal. Here sum must be equal to 30. => x + 14 + 9 + 2 = 30 => x = 5.

1. निम्न में से किशन बाग जयपुर का प्रथम डेजर्ट पार्क है। 

2. यह पार्क जयपुर शहर की सीमाओं के भीतर 30 एकड़ में फैले विशाल खुले स्थानों में से एक है। 

3. यह नाहरगढ़ किले की तलहटी में बना जयपुर का पहला रेगिस्तानी पार्क है। 

4. किशन बाग का पुनर्निर्मित परिदृश्य रेगिस्तान की पारिस्थितिकी को आदर्श बनाता है।

NTFS is short for New Technology File System. It is the standard file system that is being used by operating systems starting from Windows NT, Windows 2000, Windows XP, and even the newer versions like Vista and 7. It was originally designed to have a better performance on file storage and retrieval under the Windows NT family.