How to create the index..??

Hi

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I have the next query:

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select * from t1

where c1=1234 and c2='abc' and c3=789 and c4='fgh';

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What is the best way to create the index for the previous query.?

a) create index idx1 on t1 (c1,c2,c3,c4);

b) create index idx1 on t1 (c4,c3,c2,c1);

c) other

Does anybody have a link or a document where I can learn to structure the "WHERE" clause in a query?

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Thanks in advance.