Which of the following is commonly the MAIN concern in public cloud implementations?

Security is often cited as the top concern in public cloud implementations because, under the shared responsibility model, customers are ultimately responsible for securing their data, applications, and configurations, despite the cloud provider securing the underlying infrastructure. Organizations must actively manage identity, data protection, and network security within their cloud environment.

Flexible billing is typically considered a significant benefit of public cloud, enabling pay-as-you-go and scaling costs with usage, not a primary concern.

Scalability is a core advantage of public cloud, allowing resources to be easily adjusted up or down based on demand, rather than a main concern.

Availability is a key benefit offered by public cloud providers through redundant infrastructure and services, aiming to provide high uptime, and is generally not a main concern for adoption.