Which one of the following statements about system security is correct? O a. A computer system these days is more secure than when it was run by an operator. b. A computer running a multiuser OS is more secure than one running a single user OS. OC A computer system these days does not need an OS. A computer that is connected to the internet is less secure than one which is not connected. Which one of the following statements is correct about command line interpreters? d. Some commands are implemented within the command line interpreter but cannot be called from the command line. O D. All commands must be implemented within the command line iterpreter itself. C Some commands are implemented within the command line interpretter and others are implemented as external files. d. All commands can be called from the command line but none of them is implemented within the command line interpreter. If a scheduling algorithm always gives the printer to the process with the smallest print job, what can happen? a. printer lockup b. circular wait O c. mutual exclusion O d. starvation