What distribution option is best suited for allowing external users access to a flow?

Choosing to deploy a flow on a Lightning community page is particularly effective for providing external users access to the flow. Lightning communities are designed specifically to engage with external stakeholders such as customers or partners, allowing them to interact with Salesforce data and processes seamlessly.

When a flow is embedded in a community page, external users can easily access and engage with the flow in an intuitive manner that is consistent with the community's branding and user experience. This method leverages the robust features of Lightning communities, which include user authentication, customized layouts, and specific access controls that can be set up to ensure the right users have access to the relevant data and functionalities.

Additionally, the community pages provide a user-friendly interface, making it easier for non-Salesforce users to navigate and utilize the flow effectively, ultimately leading to improved user engagement and satisfaction.

Other options may offer accessibility but lack the tailored experience and integration specifically designed for external users, potentially complicating access or diminishing the flow's usability for those unfamiliar with Salesforce’s internal navigational structures.