If We Could Have Turned a Receiver Toward the Heavens

If we could have turned a receiver toward the heavens in hopes of observing the cosmic microwave radiation 4.5 billion years ago,at the time the solar nebula was forming,what would we have found?

A) We would have seen nothing since the CMB had not yet been created.
B) We would have seen the same blackbody curve we see now, with a peak intensity at a wavelength of about 1 mm.
C) We would have seen a blackbody curve of the same shape we see now but with a peak intensity at a wavelength shorter than 1 mm.
D) We would have seen a blackbody curve of the same shape we see now but with a peak intensity at a wavelength longer than 1 mm.

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