Select the wrong endpoint:

https://login.salesforce.com/services/Soap/u/29.0

https://test.salesforce.com/services/Soap/u/29.0/12.1.0

https://login.salesforce.com/services/Soap/c/29.0

Answer:
https://test.salesforce.com/services/Soap/u/29.0/12.1.0

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