How are complementary fluorescent probes used in in situ hybridization to visualize nucleotide locations?

• A. They alter the nucleotide sequence to make it visible under a microscope.
• B. They change the color of the cell membrane to indicate nucleotide presence.
• C. They bind to specific RNA or DNA sequences and emit fluorescence to indicate their location.
• D. They degrade non-target sequences to highlight the target sequence.

Answer: (C)