What is the burden of proving each element of an alleged sentence enhancement beyond reasonable doubt?

"The People must prove each element of an alleged sentence enhancement beyond reasonable doubt." (People v. Delgado (2008) 43 Cal.4th 1059, 1065.) " '[The] trier of fact is entitled to draw reasonable inferences from certified records offered to prove a defendant suffered a prior conviction . . . .' " (Id. at p. 1066.) On review, we examine the record "in the light most favorable to the judgment [citation] to determine whether

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substantial evidence supports the fact finder's conclusion, i.e., whether a reasonable trier of fact could have found that the prosecution had sustained its burden of proving the defendant guilty beyond a reasonable doubt [citation]." (People v. Tenner (1993) 6 Cal.4th 559, 567.)