One Gigabyte is Approximately equal is
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1000,000 bytes
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1000,000,000 bytes
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1000,000,000,000 bytes
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None of these
One Gigabyte is approximately 1 billion bytes (1000,000,000 bytes). In decimal systems, giga means 10^9 or one billion. While in binary computing 1 GB = 1024^3 bytes (approximately 1.07 billion), the question uses 'approximately' and asks for the decimal interpretation, making one billion bytes the best answer.
One gigabyte is conventionally expressed in the decimal/SI sense as 1,000,000,000 bytes (10^9) — this is how storage vendors and most everyday contexts define it. 1,000,000 bytes is only one megabyte (10^6), far too small. 1,000,000,000,000 bytes is one terabyte (10^12), far too large. So 1,000,000,000 bytes is correct. (Note: strictly in binary terms 1 GiB = 1,073,741,824 bytes, but the question's 'approximately equal' phrasing matches the standard decimal/SI figure.)