Certification answer: Answer (a) is correct. The compiler fails with the error message "non-static variable count cannot be referenced from a static context."
Answer (b) is incorrect. You can use the new operator along with the constructor of a class anywhere an object of that class would be expected.
Answer (c) is incorrect. The  that is used to declare an array can be placed after the variable name instead of the class or data type.
Answer (d) is incorrect. Class variables can be declared anywhere outside of the methods of a class, not just at the top of the class definition.
"https://www.wsj.com/market-data/quotes/" + ticker
This change is reflected in the QuoteData.java file.