A program contains the following code:

passwd$=$null;

System.gc$()$;

The method call System.gc$()$ is required because:

Question $20$ options:

Just assigning the passwd to null alone may not clear the sensitive information from the memory. The system call makes the garbage collector to clear the memory.

In fact, System.gc$()$ is unnecessary as the passwd has already been assigned to null.

Either the $1$st statement or $2$nd statement may be added but both should not be present at the same time.

To cryptanalyze the cipher