What is the Credential Access method for "2016 Ukraine Electric Power Attack (C0025)" campaign?

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Introduction to MITRE ATT&CK Framework Final Quiz

In the Introduction to MITRE ATT&CK Framework section, I cannot find the answer to the question What is the Credential Access method for “2016 Ukraine Electric Power Attack (C0025)” campaign? Can you help?

You check this right? Looks like there 2 answers. Try second one.