A nutritionist claims that the mean fat content in a brand of yogurt is less than $4$ grams per serving. If the null hypothesis is not rejected, what does this imply?

There is sufficient evidence to conclude that the mean fat content is less than $4$ grams.

There is insufficient evidence to support the claim that the mean fat content is less than $4$ grams.

The mean fat content is definitely equal to $4$ grams.

The mean fat content is more than 4 grams.