Which of the following is/are the preventions of galvanic corrosion?

• A. Avoid the unfavorable area effect of a small anode and large cathode
• B. Select the close combination of metals in galvanic series
• C. Select the far combination of metals in galvanic series
• D. Avoid the unfavorable area effect of a small anode and large cathode and select the close combination of metals in galvanic series