3. In LISP a lambda expression represents a: (a) abstract class. (b) variable type. (c) function. (d) conditional. 4. In an object-oriented language, when an object has several methods have the same name but diffe signatures, we call this: (a) inheritance; (b) overriding; (c) overloading; (d) signature clash. The language that is generally regarded as the first object-oriented language is: (a) Java. (c) Simula. (d) COBOL