Which Fidelity Index Fund Should I be buying?

I am opening up a Roth IRA with Fidelity and see that there are multiple 2055 accounts I can choose from how do I know which one to choose?

These look like all the options

FDEEX- Fidelity Freedom® 2055 Fund

FDEWX- Fidelity Freedom® Index 2055 Fund Investor Class

FNSDXJ- Fidelity Freedom® 2055 Fund Class K

Thank you!

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I believe the one with the word “index” is the preferred choice since it’ll have the lowest expense ratio.