Write C++ code to implement Stack using object orientation. Write C++ code to convert the Stack implemented in [1] to a Dynamic Stack with necessary modifications and extensions.

What distinguishes an unbounded stack implementation from a constrained stack implementation?

Describe the key distinctions that exist between constrained and unbounded stack implementations.

Implement a stack data structure in Java and demonstrate its usage by performing the following subparts: a) Explain the principles and working of a stack data structure. b) Implement the stack data structure in Java, including its operations: push, pop, and peek. c) Provide an example scenario where the stack data structure can be used effectively and demonstrate its usage. d) Analyze the time and space complexity of the stack operations and discuss their efficiency.