Q. When conducting an immersion test, the water path distance must be controlled so that:

• (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