What is the easiest and most efficient way to go about adding users to the new workspace?

You’re the Grid Owner for your sales company’s Slack Enterprise Grid instance. Currently, departments are spread across multiple workspaces and collaborate with their customers through Slack Connect. Your company is growing quickly, and you want have more control with external collaboration. You decide to set up an external workspace dedicated to Slack Connect channels. This workspace should include all current users, plus any future users.

What is the easiest and most efficient way to go about adding users to the new workspace? (Select the best answer.)
A . Make the workspace a default workspace for all current and future users.
B . Use an org-wide default channel to introduce the new workspace and it’s purpose. Ask all users who are currently using Slack Connect to join the workspace.
C . Use the workspace’s admin dashboard to add all users within your organization.
D . Sync all current and future users to the workspace using identity provider (IdP) groups.

Answer: D