Concrete cracks per NHIE

Is it normal plastic shrinkage or overhydrated concrete that causes hairline cracks in year old concrete, Different practice exams have different answers . The ICA practice exam (rip off) says plastic shrinkage.

https://www.google.com/search?client=firefox-b-1-d&ei=h8hCXY_HFcSp_Qap-K-wBQ&q=normal+plastic+shrinkage+in+concrete+floors&oq=normal+plastic+shrinkage+in+concrete+floors&gs_l=psy-ab.3..33i299.10909.23153..24605...0.0..0.145.2327.0j19…0…1…gws-wiz…0i71j0i22i30j33i22i29i30.hfhZWf22ZAM&ved=0ahUKEwjPps3CxOHjAhXEVN8KHSn8C1YQ4dUDCAo&uact=5

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