Which statements are true concerning vertical scope? $($Choose every correct answer.$)$

Multiple select question.

It can be reduced through company mergers and acquisitions.

It is the extent to which a firm engages in the activities that make up the industry's entire value chain system.

It is defined by the range of activities that may extend from initial production to after$-$sale customer service.

It is the range of product and service segments that a firm serves within its product and service market.