could you help me answer 2,3,4, this is operating system question

2. How many segments are there in Nachos address space and what are they? Which source file did you read to find out these segments? 3. Nachos: Study kernel.cc in code/threads. Pay attention to Kernel::Initialize0. 1. When you run ". achos" under code/thread directory, is a timer (i.e., alarm) object created? Ifso, which line of the code creates it? 4. In the contiguous memory management discussed in class, a base and a limit registers arc used in translating a virtual address to the corresponding physical address 1. Write a pseudo code for function "int translate(VA)", which returns the physical address given an input of VA. Make sure to check the legality of the resulting PA 2. How many segments are there in Nachos address space and what are they? Which source file did you read to find out these segments? 3. Nachos: Study kernel.cc in code/threads. Pay attention to Kernel::Initialize0. 1. When you run ". achos" under code/thread directory, is a timer (i.e., alarm) object created? Ifso, which line of the code creates it? 4. In the contiguous memory management discussed in class, a base and a limit registers arc used in translating a virtual address to the corresponding physical address 1. Write a pseudo code for function "int translate(VA)", which returns the physical address given an input of VA. Make sure to check the legality of the resulting PA