In the figure above, which number refers to the layer mask?
A. 2
B. 3
C. 4
D. 5
Answer: D
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Use the method of finite differences to calculate the value of 
A Java ______ specifies behaviors that are common to a group of classes.
a) package b) final class c) interface d) subclass
Which of the following statements is true?
a. Local variables are automatically initialized. b. Every instance variable has a default initial value—a value provided by Java when you do not specify the instance variable’s initial value. c. The default value for an instance variable of type String is void. d. The argument types in the method call must be identical to the types of the corresponding parameters in the method’s declaration.
The TreeMap and TreeSet classes use a ________ for the underlying data structure.
a) heap b) double-ended queue c) red/black tree d) circular queue e) full tree