Which of the following BEST describes the purpose of Border Gateway Protocol (BGP)?

This answer is partially descriptive but technically imprecise - BGP does not operate between generic 'internet routers' but specifically between autonomous systems, and 'network paths' omits the critical AS-boundary and policy-based routing distinction that defines BGP.

RIP version 2 is a completely separate interior gateway protocol using hop-count metrics within a single autonomous system; BGP does not provide or relate to RIPv2 advertisements in any way.

Firewall services for cloud applications are provided by next-generation firewalls, security groups, or cloud-native services such as AWS WAF or Azure Firewall - BGP is a routing protocol with no firewall or security filtering functionality.

BGP is specifically designed as an inter-autonomous system (exterior gateway) routing protocol that maintains a table of IP network prefixes and their best paths between distinct autonomous systems. Unlike interior gateway protocols, BGP uses path vector routing and considers AS-path attributes, policies, and metrics to determine the most efficient routes between organizations and ISPs on the internet.