Back (someone) up

Do you know the English expression “to back (someone) up“? Read the conversation below. Can you guess the meaning?

Dean: Did Ned ask you about the money missing from the cash register?

Steve: Yes, he did. I told him I hadn’t touched the cash register all day.

Dean: Did he believe you?

Steve: Yeah, I think so. Tracey backed me up. She said she had been with me all day and I hadn’t touched the cash register.

Does it mean:

a) support someone

b) stand behind someone

c) blame someone

d) keep a secret for someone

The answer is below!↓

abundance bank banking banknotes

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Answer: a) support someone