The method-call stack contains the memory for local variables on each invocation of a method during a program’s execution. This data, stored as a portion of the method-call stack, is known as the _________ or ______________ of the method call.

Firewalls use which of the following to hide the internal network topology from outside users?

a. Packet filtering b. SPI c. ACL d. NAT

Write the commands to remove all the space characters stored in the shell variable text. Be sure to assign the result back to text. First use tr to do it and then do the same thing with sed.

What will be an ideal response?