What causes this error message from the Meraki cloud?

A configuration has been made to add to every switch port a new port description. The script worked initially, but after a few seconds, an HTTP 429 status code was received.

What causes this error message from the Meraki cloud?
A . The wrong API key is used to query the data.
B . The rate limit of the Cisco Meraki API is exceeded.
C . The API key has expired.
D . The device goes offline while you poll the API dashboard.

Answer: B

Explanation:

Reference: https://community.meraki.com/t5/Developers-APIs/my-API-Limit-exceed-and-key-is-notworking/td-p/64034