Which plan is specifically associated with private corporations as a retirement investment option?

The 401(k) plan is specifically associated with private corporations as a retirement investment option. This type of retirement plan allows employees of private sector companies to save and invest for their retirement on a tax-deferred basis.

In a 401(k) plan, both employees and employers can make contributions, often offering matching contributions, which helps to incentivize savings for retirement. These plans also provide flexibility in investment options, allowing participants to choose how their money is invested among various funds.

In contrast, other options, like the 403(b), are typically associated with non-profit organizations and public educational institutions. The Roth IRA is an individual retirement account that allows individuals to save after-tax income, with tax-free growth and distributions in retirement, but it is not specific to corporations. Pension plans, while they can be offered by private employers, are more traditionally associated with defined benefit plans, which guarantee a specific payout at retirement, differing from the defined contribution structure of a 401(k).

Overall, the 401(k) serves as a cornerstone for retirement planning within the private sector, making it the correct choice in this context.