String sentence;
String str1, str2, str3, str4;
Int length1;sentence = "First exam is on Monday.";str1 = sentence.substring(6, 12) ;
Str2 = str1.substring(0, 4) ;
Str3 = sentence.replace('i', '#') ;
Str4 = sentence.indexOf("on") ;length1 = sentence.length() ;Based on the code above, what is the value of str3?

A) "First exam is on Monday."
B) "F#rst exam #s on Monday."
C) "F#rst exam is on Monday."
D) "#i### #### i###########."

____ permits the same operation to invoke one set of results on data values of a base class and a different set of results on data values of a derived class.

A) Polymorphism
B) Inheritance
C) Class construction
D) Encapsulation

E-commerce is the process of buying and selling goods and services.

What is the name for Java classes that are provided so that values of primitive data types can be treated as objects?

A) interfaces
B) extensions
C) wrappers
D) event handlers