Consider the following declarations: public interface Encryptable
{
void encrypt(String key);
}
public class SecretText implements Encryptable
{
private String text;
{
// code to encrypt the text using encryption key goes here
}
}
Which of the following method headers should be used to complete the SecretText class?
a. public void encrypt().
b. void encrypt(String aKey).
c. public void encrypt(String aKey, int shift).
d. public void encrypt(String aKey).

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