Q$1)$ You are developing a new social network $($such as Facebook, Instagram, Twitter$/$X$,$ etc$).$ Your new social network should:

$($i$)$ have different $($at least $3)$ types of profiles with distinct characteristics and properties $($for example, user profile, company profile, etc$)$

$($ii$)$ allow people to add$/$friend and follow others $$ observe that add and follow are two different operations

$($iii$)$ allow users to create posts $($with text, images, etc$)$

$($iv$)$ have a timeline of other people's $($friend and followed$)$ posts

$($i$)$

List, at least, five elements, data structures, or concepts seen and studied in the CSCU$9$A$3$ module that you consider essential for the design of the proposed system. Tip.: only list topics seen in CSCU$9$A$3.$

$($ii$)$

Briefly describe your solution to the mentioned problem using and properly connecting the $($at least five$)$ mentioned elements$/$concepts$/$data structures.

$($iii$)$

Detail all the unit tests you would create for your system to ensure it is working correctly.