Which of the Following Statements Concerning Applications or Capabilities of Soil

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the electrical resistance block?

A) requires "destructive sampling" for each measurement
B) good to turn on automatic irrigation at -50 kPa
C) used to turn on irrigation when soil moisture potential reaches -200 kPa
D) would give the same reading for both a loamy sand and a silt loam if both contained 15%
E) both A and D