Answer:
a. Most moderate and high-end monitoring services rely on an advertising business model similar to Google and offer their services for free.
Step-by-step explanation:
Subscription management tools are employed by businesses to monitor the transaction activities of customers on their business pages. The software needed for this monitoring is provided by companies who charge some fees for their plans, especially, the most comprehensive plans.
Some services they render could be sales analytics, payment management, upgrade, and downgrade of plans. Also, search engine optimization makes the brand visible to customers who use social media. The tone of conversations can also be measured as positive, negative, or neutral with the aid of these monitoring tools.