How many distinct catalytic active sites does E.coli DNA polymerase I have on its single polypeptide chain?

Name: How many distinct catalytic active sites does E.coli DNA polymerase I have on its single polypeptide chain?
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Question

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E. coli DNA polymerase I has three distinct catalytic active sites on its single polypeptide chain: a 5'→3' polymerase activity site, a 3'→5' exonuclease (proofreading) site, and a 5'→3' exonuclease site.

How Many Distinct Catalytic Active Sites Does E