(((VII))) is the correct form. It denotes to times seven (7) by 1000 - 3 times.
Improved answer as follows:-
7 billion in Roman numerals: ((DC))M = 700*1000*10*1000 = 7,000,000,000
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1 billion in roman numerals is 'm' with two horizontal lines above it: = m
to write seven billion in roman numerals you have to put 7000000000
7 as a Roman numeral is VII
II.V times Xxii
Roman numerals only apply to numbers. so April can't be in roman numerals, but seven is VII