Assigning a subclass reference to a superclass variable is safe ________.
a. because the subclass object has an object of its superclass.
b. because the subclass object is an object of its superclass.
c. only when the superclass is abstract.
d. only when the superclass is concrete.
b. because the subclass object is an object of its superclass.
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The __________ encryption scheme is designed to enable encryption by a user's public key with decryption by the user's private key.
Fill in the blank(s) with the appropriate word(s).
Suppose a method p has the following heading:
``` public static int[][] p() ``` What return statement may be used in p()? a. return 1; b. return {1, 2, 3}; c. return int[]{1, 2, 3}; d. return new int[]{1, 2, 3}; e. return new int[][]{{1, 2, 3}, {2, 4, 5}};
The accompanying figure represents the ____ alpha channel.
A. Background B. Dark Gray C. Light Gray D. Composite
Strong passwords are at least five characters long.
Answer the following statement true (T) or false (F)