Which of the following is implied authority of a partner of a firm?

Implied authority under s.19(1) covers "an act of a partner which is done to carry on, in the usual way, business of the kind carried on by the firm"; the powers "to transfer immovable property of the firm", "to withdraw a suit filed on behalf of the firm" and "to submit a dispute relating to the business of the firm to arbitration" are excluded by s.19(2).