$$ Expand the "SalesData" table from Question $3$ with additional columns for conditional formatting, data bars, and sparklines.

a$)$ Apply conditional formatting effectively to highlight cells in the "Sales" column.

b$)$ Implement a custom data bar rule and create a custom table style using the expanded "SalesData" table.

c$)$ Insert a sparkline and add a slicer with appropriate formatting to the expanded "SalesData" table.