Unrecorded assets when taken over by a partner are shown on:

The correct answer is Option (3) → Credit of Realisation Account

An unrecorded asset is not in the books, so it is not transferred to the Realisation Account. When a partner takes it over, the firm has realised it at the agreed value, which is a gain of realisation. The partner's capital account is debited and the Realisation Account is credited:

Partner's Capital A/c     Dr.
    To Realisation A/c

No cash comes in, so the Bank Account is not touched.