At $90 \, ^\circ C$,the concentration of $H^+$ and $OH^-$ ions in pure water is $10^{-6} \, M$. What is the value of $[H^+] + [OH^-]$ at this temperature?
- A$10^{-14}$
- B$10^{-12}$
- C$2 \times 10^{-6}$
- D$2 \times 10^{-7}$
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