$]$ You are tasked with developing a music album management application using Qt$\text{'}$s model$/$view framework. The application will store and display information about various music albums, including the composer, album name, cost $($stored as a double$),$ and rating $($out of $100,$ stored as an int$).$ To manage this data, you will create a custom model by subclassing QAbstractTableModel. This model should be well$-$behaved and editable, supporting all necessary functions for data manipulation, such as adding new entries and editing existing ones. The data should be displayed in a standard QTableView, with a header row for clarity. The cost should always display the cents, even if the value is a whole number $($e$.$g$.,10\mathrm{.}00).($Note: The scenario is applicable to questions $3\mathrm{.}13\mathrm{.}4)3\mathrm{.}1.$ How would you define a custom model that inherits from QAbstractTableModel to store music album information? $3\mathrm{.}2.$ How would you ensure that the cost is always displayed with two decimal places $($cents$),$ even if it is a whole number? $3\mathrm{.}3.$ What are the necessary steps to make the