Captcha alternatives

Good morning,
I know this subject has come up before in this group but could not find the related emails on Captcha.
I realize that captchas are not very accessible but what are some alternative ways that captchas can work for everyone?
Alternative text can be added to the images or a voice narration were some of the alternatives I have read.
If captchas are wanted because they mitigate spam attacks, what alternatives are there?
Looking forward to your comments.

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Judy Christianson | Program Coordinator-Accessible Documents
The Regional Municipality of Durham
Judy.christianson@durham.ca | 905-668-7711 extension 2071 | durham.ca<https://can01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.durham.ca%2F&data=02%7C01%7C%7C931955ae5e924016330408d83586802f%7C52d7c9c2d54941b69b1f9da198dc3f16%7C0%7C0%7C637318199070458947&sdata=PlwYsg8yXJ7iogBQMtY0Rs9fO9ySp09HCc8Xzmm6gP4%3D&reserved=0>
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Received on Wednesday, 13 October 2021 14:00:55 UTC