Which of the following is/are true for an abstract class?i) Abstract classes in PHP are declared with the help of abstract keyword.ii) A class is declare abstract by using the keyword implements.iii) It is a class that really isn’t supposed to ever be instantiated but instead serves as a base class.iv) Attempting to instantiate an abstract class results in an error.

• A. Only i)
• B. Only iii)
• C. ii) and iv)
• D. ii), iii) and iv)