Consider the following statements regarding a perfectly black body: 1. A perfectly black body absorbs all thermal radiation incident on it, regardless of wavelength or angle of incidence. 2. Ferry's black body is a practical realization of a perfectly black body, consisting of a double-walled hollow sphere with a tiny aperture. 3. A perfectly black body must appear black in color at all temperatures. Which of the statements given above is/are correct?

Options:

• A: 1 only
• B: 1 and 2 only
• C: 2 and 3 only
• D: 1, 2 and 3

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