Which type of account is specifically classified as not an investment but rather a vehicle for investment?

The correct choice is classified as an IRA, which stands for Individual Retirement Account. An IRA serves as a vehicle for investment, allowing individuals to contribute funds that can then be invested in various assets like stocks, bonds, or mutual funds. While the funds within an IRA can be used for investment purposes, the account itself is not an investment; rather, it is a means to save for retirement with certain tax advantages.

This distinction is important because it differentiates the account type from various investment products. Other terms in the options refer to specific types of retirement accounts (Roth and Traditional IRAs) or brokerage accounts, which are used to buy and sell investments directly. However, the IRA's core function is to facilitate the growth of retirement savings, rather than being an investment itself.