Before the expiry of limitation, B signs a written acknowledgment of his liability to
A. Under Section 18 of the Limitation Act, 1963, the effect is:

Explanation: Section 18 of the Limitation Act provides that where, before the expiry of the period of limitation for a suit in respect of a debt or other right, the debtor makes a written ACKNOWLEDGMENT of liability, signed by him or those through whom he claims, a fresh period of limitation is computed from the date of the acknowledgment. The acknowledgment must be made before the original period expires. Section 25 (promise to pay a time-barred debt) is a different provision reviving a fully time-barred debt only if the promise is in writing and signed. Section 18 extends, it does not revive, limitation.