Shape of universe

The above are three cosmological models suggested by Friedmann, a Russian physicist, by applying Einstein's theory of general relativity. Which of the following statements is correct?

a) Many people now tend to agree with the flat universe model.

b) If the open universe model is right, the universe will expand forever.

c) If the closed universe model is right, the universe will eventually stop expanding, and then collapse because the density of the universe is larger than the critical density.

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