What a 95% confidence interval means

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A survey estimates mean maize yield as 2.4 t/ha with a 95% CI of 2.1 to 2.7. Which is the best interpretation?

95% of farms yield between 2.1 and 2.7 t/ha.The method used produces intervals that contain the true mean in 95% of repeated samples.There is a 95% chance the sample mean is 2.4.The true mean is definitely between 2.1 and 2.7.