Which of the following statements is true about bromide ions?
A) Bromide ions are typically formed by the loss of an electron from bromine atoms.
B) Bromide ions are often used in photographic film due to their high reactivity with light.
C) Bromide ions are negatively charged and commonly found in salts like sodium bromide (NaBr).
D) Bromide ions are primarily used as a source of bromine gas in industrial processes.