A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?
A
Superscript 32 subscript 17 upper P
B
Superscript 17 subscript 15 upper P.
C
Superscript 30 subscript 15 upper P.
D
Superscript 32 subscript 15 upper P.