Read the excerpt from act 1, scene 4 of The Tragedy of Macbeth. King Duncan praises Macbeth and Banquo for their victory against the rebel forces.

Duncan. Welcome hither:
I have begun to plant thee, and will labour
To make thee full of growing. Noble Banquo,
That hast no less deserv’d, nor must be known
No less to have done so, let me infold thee
And hold thee to my heart. [Embraces BANQUO.]

Banquo. There if I grow,
The harvest is your own.

What does Banquo mean when he says, "There if I grow, / The harvest is your own”?

He needs Duncan’s help to complete a task.
He wants to thank Duncan for his assistance.
He owes any success he might have to Duncan.
He appreciates Duncan’s invitation to speak.