Explanation:

- Option 1: A Secret Partner is known as a partner whose association is not disclosed to the public, but they participate in the firm's profits directly, not through another partner.

- Option 2: "Quasi" does not specifically relate to partnership arrangements involving profit sharing through another partner.

- Option 3: A Partner in Profit Share Only is a partner who shares in the profits but might not bear losses or participate in management. This option sounds like it could be related, but it usually implies direct profit sharing from the firm.

- Option 4: A Sub Partner receives a share of profit from a regular partner's share, without being directly involved with the firm or having liabilities toward third parties.