Medium Inc is on a Standard Slack plan and has recently hired Preethi as a...

Since Preethi needs access to multiple channels but only for a limited time:

"A Multi-channel Guest is the best choice when someone needs access to more than one channel but does not need full member access across the workspace. You can also set an expiration date for their access."

Single-channel Guest would be too limiting, and full Member access would provide more access than necessary, posing a security risk.

(Reference: Slack Administration Study Guide - Managing Guest Access)

===========

—