How to answer below questions based on cloud computing!

$1.$ Give the basic differences between Infrastructure as a Service, Platform as a Service and Software as a Service?

$2.$ Provide an explanation of Type $1($Bare Metal$)$ and Type $2($Hosted$)$ Virtualization. Provide a comparative analysis of these two technologies?

$3.$ Provide your solution in the form of a cloud computing architecture design and provide sufficient explanation for the following cases:

A group of traders in a market want to create a Cloud Computing$-$based MSME application with the following specifications:

a$.$ Can be accessed using an application on a cellphone $($can use API$)$

b$.$ Using a simple database such as MySQL or PostgresSQL

c$.$ Have a website and can make transactions through website pages $($like an online shop$)$

d$.$ Integrated system with Payment Gateway

e$.$ Using Elasticity to ensure system operations remain stable