Final answer:
d. Partnership at will. A partnership without a definite period of existence and which can be dissolved at any time by any of the partners is called a Partnership at Will.
Step-by-step explanation:
A partnership without a definite period of existence and which can be dissolved at any time by any of the partners is called Partnership at will. In this type of partnership, there is no fixed term for the partnership and any partner can terminate the partnership at any time without any specific reason. This type of partnership is quite flexible and allows partners to dissolve the partnership whenever they want.