Hristo Created a Mortgage, in Favour of Tippi, Over a Piece

Hristo created a mortgage, in favour of Tippi, over a piece of land called Blackacre. Which of the following statements is TRUE?

A) Hristo must have purchased Blackacre from Tippi.
B) If the mortgage created a charge, Blackacre must be located in a land titles system jurisdiction.
C) If the mortgage is enforceable against a subsequent purchaser of Blackacre, Blackacre must be located in a registry system jurisdiction.
D) If the mortgage was indicated on a certificate of title, Blackacre must be located in a registry system jurisdiction.
E) If Hristo is entitled to create a subsequent mortgage, Blackacre must be located in a land titles system jurisdiction.