Compare endorectal versus endovaginal ultrasound transducers in terms of frequency and footprint.

• A. Endorectal transducers are low-frequency with large footprints; endovaginal are small and high-frequency.
• B. Endorectal uses coil-based design; endovaginal uses crystals only.
• C. Both are small internal probes; endorectal transducers are typically high-frequency (≈5–12 MHz) for detailed pelvic imaging; endovaginal transducers are also small with frequencies in a similar range, optimized for internal access and resolution.
• D. Endovaginal transducers require external coupling gel only.

Answer: (C)