Based on all data presented in the stained agarose gel, which of the following statements is correct?
A. The original piece of DNA was circular and was cut by EcoRI twice and HindIII only once.
B. The original piece of DNA was linear and was cut by EcoRI twice and HindIII only once.
C. The original piece of DNA was circular and was cut by EcoRI once and not at all by HindIII.
D. The original piece of DNA was linear and was cut by EcoRI once and not at all by HindIII.