Answer: Basic

The question asks which support plan provides best practice information, health status and notifications, and 24/7 access to billing information at the lowest possible cost. According to Microsoft's Azure support plans documentation, the Basic support plan includes: 24x7 access to billing and subscription support, online self-help, documentation, whitepapers, and support forums; access to the full set of Azure Advisor recommendations (best practices); and access to personalized Service Health Dashboard & Health API (health status and notifications). The Standard support plan is more expensive and includes additional technical support features not mentioned in the question. The community discussion strongly supports C (Basic) with 100% consensus in the answers_community data and multiple comments explaining that Basic includes all the listed features at the lowest cost, while Standard is not the minimum cost option. The key insight is that the question specifically mentions '24/7 access to billing information' (which Basic provides), not '24/7 technical support' (which requires higher-tier plans).

Author: LeetQuiz Editorial Team