A girl pushes her physics book up agains...

A girl pushes her physics book up against the horizontal ceiling of her room as shown in the figure. The book weights 20 N and she pushes upwards with a force of 25 N. The choices below list the magnitudes of the contact force `F_(CB)` between the celling and the book, and `F_(BH)` between the book and her hand. Select the correct pair.

`F_(CB)=20N and F _(BH)=25N`

`F_(CB)=25N and F _(BH)=45N`

`F_(CB)=5N and F _(BH)=25N`

`F_(CB)=5N and F _(BH)=45N`

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