What does 'hand it to her' or 'give her credit' mean?

[Min Kin]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #19 "Idioms with Hand", question 8

Jane Williams is a very good investigative reporter, you've got to hand it to her.

(a) give her credit
(b) give a present to her
(c) give a promotion to her
(d) forgive her

English Idioms and Expressions, Intermediate level

ESL/EFL Test #19 "Idioms with Hand", answer 8

Jane Williams is a very good investigative reporter, you've got to give her credit.

Correct answer: (a) give her credit
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Hi,

I don't know what the ' hand it to her' nor ' give her credit' mean?

Do they mean:
trasfer some case to her and let her to investigate?
or
show something to her and help her to investigate?

Min_Kin

[Mister Micawber]

.
hand it to her', ' give her credit' = recognize her ability/success.
.
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Native English teacher at Mister Micawber's