A) \[\text{Pl/4}\,E{{d}_{1}}{{d}_{2}}\]
B) \[\text{Pl}\,\pi \,E{{d}_{1}}{{d}_{2}}\]
C) \[\text{Pl/4}E({{d}_{1}}.{{d}_{2}})\]
D) \[\text{4P}\text{.l/}\pi \text{.}E.{{d}_{1}}.{{d}_{2}}\]
Correct Answer: D
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