Which of the following statements is/are correct about stray current?

• A. It usually encountered in cathodic-protection systems
• B. It refers to extraneous direct current in the earth
• C. Acceleration corrosion will occur at the point where the current enters the soil
• D. Stray current refers to extraneous direct current in the earth that usually encountered in cathodic protection systems and accelerated corrosion will occur at the point where current enters the soil