Differentiate the following terms as they are used in main memory:

a$)$ base and limit register

b$)$ logical and physical address space

c$)$ contiguous and non$-$contiguous allocation

Explain in detail what is address binding and explain the stages of address biding.

Explain the memory management unit $($MMU$)$ as used in main memory.

Briefly describe the following memory allocation techniques used in variable partitioning of the available free space in main memory:

a$)$ First fit

b$)$ Best fit

c$)$ Worst fit

With the help of a diagram, explain the concept of swapping as used in operating system.

Explain the following terms as they are used in main memory:

a$)$ Fragmentation

b$)$ Segmentation

c$)$ Paging

Explain in detail how operating system helps in protection and security information.