Are the following statements about protein structure prediction true or

Are the following statements about protein structure prediction true or.

Are the following statements about protein structure prediction true or false?
A. The prediction of secondary structure relies on information regarding the known occurrence of amino acid residues in α helices or β sheets from X-ray crystallographic data.
B. The prediction of secondary structure is highly accurate, nearly 100% correct.
C. To predict the tertiary structure of a protein based on its amino acid sequence, it is necessary that the protein of interest is homologous to another protein whose tertiary structure is already known.

Are the following statements about protein structure prediction true or

 
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