Select one or more:

a$.$ LBOs are an example of a financial merger undertaken to create a high$-$debt private corporation with improved cash flow and value.

b$.$ Consolidation involves the combination of two or more firms, and the resulting firm maintains the identity of one of the firms.

c$.$ The synergy of merger is the economies of scale resulting from the merged firms' lower overhead.

d$.$ Vertical merger is a merger of two firms in the same line of business.