$($a$)$ Bus company GreenBus wants to be reactive to changing requirements as they create software that shows users the buses, they can ride from one place to another. They created an early prototype of the software during a two$-$week sprint to get feedback and fix problems the original code had during the next sprint. Daily meetings are used to keep everyone on the same page. Which software development process has followed by GreenBus?

$($b$)$ A company called PlayforU sends the latest version of their game to a small number of end users to make sure it works as expected. What type of testing is it$?$

$($c$)$ Mary finds an error in her code and fixes it$.$ To prevent this same error from recurring later, Mary writes a test case to detect the presence of that bug. What type of testing is it$?$

$($d$)$ John is preparing to release a new social media application. During common usage, to catch errors$/$defects in the application, he hired a

group of social media influencers to evaluate the application and report issues they observed. What type of testing is this?

$($e$)$ Let us assume that you have written a file that will be used in the software for a medical device. You scheduled a meeting with members of your team where they will sit down and go through your file line by line, with the goal of identifying errors$/$bugs$.$ Which type of review is it$?$

$($f$)$ One of your team members is developing a car racing video game. She$/$He created a class Car and a class Player. The intention functionality is that the player shall be able to get into the car and drive it$.$ The team member has written a set of test cases to ensure that the interaction between these two classes is functioning properly. In which type of testing these test cases will be useful?