Institution: SONALI BANK LTD Exam: Sonali Bank Ltd - Assistant Programmer - 26.08.2016 ||
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

The correct answer to the question "How many instances of an abstract class can be created?" is indeed **A) blank**. An abstract class in object-oriented programming is a class that cannot be instantiated directly. This means you cannot create an object (or instance) of an abstract class on its own. Instead, abstract classes are designed to be extended by other classes, which implement the abstract methods defined in them.

By definition, an abstract class can contain both fully implemented methods and abstract methods (methods without implementation). The purpose of an abstract class is to provide a common interface and shared functionality to derived classes, allowing them to inherit and override those methods as needed.

Since you cannot create an instance of an abstract class, the answer is "blank" — indicating that no instances can be generated directly from it. Instead, one must create a subclass that inherits from the abstract class and implement its abstract methods before creating an instance of that subclass. This design pattern promotes code reuse and enforces a certain structure in the class hierarchy.