**Category:** Inorganic Chemistry  
**Subtype:** Chemical Compounds  
**Problem Description:** Identify which compound is used for plastering and statue casting.  

**Options:**  
A. \(\mathrm{CaSO}_{4} .2 \mathrm{H}_{2} \mathrm{O}\) (Gypsum)  
B. \(\mathrm{CaSO}_{4} . \mathrm{H}_{2} \mathrm{O}\)  
C. \(\mathrm{CaSO}_{4}\)  
D. \(\mathrm{CaSO}_{4} \cdot 3 \mathrm{H}_{2} \mathrm{O}\)  

**Key Focus:** Determine the correct hydrated form of calcium sulfate used in these applications.