Show me the steps to solve What is return on marketing investment $($RoMI$)?$

The measure of the revenue a marketing campaign generates compared to the revenue lost to a competitor$$s marketing campaign

The measure of the revenue a marketing campaign generates compared to the cost of running the campaign

The measure of the revenue a marketing campaign generates compared to the revenue of previous marketing campaigns

The measure of the revenue invested in the running of a campaign compared to the money invested in regular promotions