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An attacker is trying to crack an encryption scheme in order to discover secret information. The attacker is able to get his own plaintext messages encrypted by the same mechanism used to protect the secret information he is trying to obtain. This method of attack is known as:

a. Chosen plaintext attack b. Chosen ciphertext attack c. Cryptanalysis d. Man in the middle

Analyze the following code:

``` public class Test { public static void main(String[] args) { A a = new A(); a.print(); } } class A { String s; A(String s) { this.s = s; } void print() { System.out.println(s); } } ``` a. The program has a compile error because class A is not a public class. b. The program has a compile error because class A does not have a default constructor. c. The program compiles and runs fine and prints nothing. d. The program would compile and run if you change A a = new A() to A a = new A("5").