Which of the following is the correct match?
- AOrdinary form of borax $:$ $Na_2B_4O_7 \cdot 5H_2O$
- BColemanite $:$ $Ca_2B_6O_{11} \cdot 5H_2O$
- CBoronatrocalcite $:$ $2Mg_3B_8O_{15} \cdot MgCl_2$
- DOctahedral form of borax $:$ $Na_2B_4O_7 \cdot 10H_2O$
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