As a general rule, secure systems designers should use complex security mechanisms to prevent their systems being easily compromised. a. true b. false A sandbox is a technique by which a downloaded program is executed is such a way that each of its instructions can be fully controlled. If an attempt is made to execute an instruction that has been forbidden by the host, execution of the program will be stopped. a. true b. false In practice, access to any part of a distributed system is controlled by a special kind of reference monitor known as a firewall. a. true b. false With distributed systems, the security environment consists of multiple administrative domains. a. true b. false In the Reduced Interfaces for Secure System Components (RISSC) approach, any security-critical server will be placed on a separate machine isolated from end-user systems using low-level secure network interfaces. a. true b. false