The funds in our "Magnificent Retirement Mutual Funds" list are among the best managed and best performing mutual funds available. If you are just finding out about our Top-Ranked Funds list, we welcome you!

How can you tell a good mutual fund from a bad one? It's pretty basic: if the fund is diversified, has low fees, and shows strong performance, it's a keeper. Of course, there's a wide range, but using our Zacks Rank, we've found three mutual funds that would be great additions to any long-term retirement investors' portfolios.

Let's break down some of the mutual funds with the highest Zacks Rank and the lowest fees.

Artisan Mid Cap Fund Investor (ARTMX Quick QuoteARTMX - Free Report) : 1.2% expense ratio and 0.94% management fee. ARTMX is a Mid Cap Growth mutual fund. These funds aim to target companies with a market capitalization between $2 billion and $10 billion that are also expected to exhibit more extensive growth opportunities for investors than their peers. ARTMX has achieved five-year annual returns of an astounding 13.24%.

TCW Select Equities I (TGCEX Quick QuoteTGCEX - Free Report) : 0.79% expense ratio and 0.65% management fee. TGCEX is a Large Cap Growth mutual fund, and these funds invest in many large U.S. firms that are projected to grow at a faster rate than their large-cap peers. TGCEX, with annual returns of 15.98% over the last five years, is a well-diversified fund with a long track record of success.

Janus Henderson Global Technology A (JATAX Quick QuoteJATAX - Free Report) . Expense ratio: 0.99%. Management fee: 0.64%. Five year annual return: 21.93%. JATAX is a Sector - Tech mutual fund, allowing investors to own a stake in a notoriously volatile sector with a much more diversified approach.

There you have it. If your financial advisor had you put your money into any of our "Magnificent Retirement Mutual Funds," then they've got you covered. If not, you may need to talk.

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To learn more, read our just-released report: 9 Retirement Mistakes You Need to Avoid.