What is the disadvantage stated by the text for defining a class of queues quickly using a class of lists?

In Java, a reference variable is __________ because it can reference objects of types different from its own, as long as those types are related to its type through inheritance.

a. static b. dynamic c. polymorphic d. public

Which of the following is an invalid initialization?

A. char code = "b"; B. int i = 14; C. long long = 1000000000; D. float payRate = 14.25; E. double pi = 3.1415926536;