In which situation would a company implement a reverse proxy as a security solution?

In which situation would a company implement a reverse proxy as a security solution?

• when the company has a database and needs to point to a DNS server that uses different IP addresses for development resources
• when the company wants all responses to clients to look like they came from the same server instead of individual ones
• when a hash is created based on the IP address of the request to a particular protected server
• when responses frorri servers need to be sent over different paths to ensure quality response time to the client devices making the requests