In a Southern blotting experiment, why might a researcher choose a radioactive probe over a fluorescent one?

• A. Radioactive probes provide faster results than fluorescent probes.
• B. Radioactive probes are cheaper to produce than fluorescent probes.
• C. Radioactive probes are safer to handle than fluorescent probes.
• D. Radioactive probes can be more sensitive and allow for detection of low-abundance sequences.

Answer: (D)