Dear client,
Based on the information provided, it appears that "D" is the rightful owner of the plot.
When "A" sold the plot to "D" on 19th Dec 2007 through registered Sale Deed, "A" did not have the right to sell the property since "A" had already sold the same property to "C" earlier in May 2007. Therefore, the Sale Deed executed by "A" in favor of "D" was invalid.
Later, on 7th July 2011, "A" sold the same property to "E" through "B" using Agreement of sale cum with GPA (with Possession). However, since "A" had already sold the property to "C" and subsequently to "D", "A" did not have any right to sell the property to "E". Therefore, the sale made by "A" to "E" through "B" is also invalid.
In conclusion, since "A" did not have the right to sell the property to "D", the sale deed made in favor of "D" is invalid. However, since the subsequent sale made by "A" to "E" through "B" is also invalid, "D" remains the rightful owner of the property.