Question $31"$In the traditional UNIX structure which one of the following is not part of the OS kernel?"Options:a$.$ Virtual memoryb. Libraries and compilers.c$.$ Kernel interface to hardware.d$.$ System call interface to the kernel.Question $32$"Which one of the following statements is correct about command line interpreters?"Options:a$.$ All commands must be implemented within the command line interpreter itself.b$.$ Some commands are implemented within the command line interpreter but cannot be called from the command line.c$.$ Some commands are implemented within the command line interpreter 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.Question $33$"The main disadvantage of the simple OS structure is$?$"Options:a$.$ User Interfaceb. Performancec. The kernel is too small in size.d$.$ ProtectionQuestion $34$"Which on of the following statements is not correct about programming languages used in developing operating systems?"Options:a$.$ Most operating systems are written in C or even C$++$ but still have some Assembly.b$.$ System programs may be written in very high level programming languages like Python.c$.$ The advantage of using Assembly language in OS development is that the code is more compact and can be written faster.d$.$ Early operating systems were written in Assembly.Question $35$"Which one of the following is an advantage of the Layered OS structure?"Options:a$.$ It was well received by customers.b$.$ The system call takes longer than other systems that are non$-$layered.c$.$ It tends to be less efficient than other types.d$.$ It is more reliable to use and easier to develop, debug, and update.