Explanation:

- Perquisites: These are additional benefits enjoyed by employees, like a company car or housing, not typically tied directly to shares or ownership in the company.

- Retirement Benefits: These are benefits received upon retirement, such as pension plans, not relevant to share allotment upon joining.

- Co-partnership: This involves employees receiving shares in the company, making them part-owners, often aligning their interests with those of the company for long-term success.

- Pay and Allowances: This refers to the regular salary and additional stipends given to an employee, unrelated to share allotments.

Correct Answer: Co-partnership