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In a mock test, given answer to following question is a and b. I will be obliged if any one can explain this answer to me.

2. Which of the following code is valid?
a) <!DOCTYPE SYSTEM SYSTEM "test.dtd">
<SYSTEM></SYSTEM>
b) <!DOCTYPE PUBLIC SYSTEM "test.dtd">
<PUBLIC></PUBLIC>
c) <!DOCTYPE PUBLIC PUBLIC "test.dtd">
<PUBLIC></PUBLIC>
d) <!DOCTYPE SYSTEM PUBLIC "test.dtd">
<PUBLIC></PUBLIC>
 
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