When conducting an immersion test, the water path distance must be controlled sothat:

• A. Spurious signals are not created by surface waves on the test piece
• B. The (water path distance)/(diameter) ratio does not result in asymmetric standing waves
• C. The test piece discontinuity indications appear between the first front and first back surface echos
• D. The second front surface echo does not appear on the CRT screen between the first front and first back surface echos