One of them.
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One. Although integers ending in 0 are ambiguous. If the number is known to be accurate to the nearest ten, for example, then there are 3 significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
The answer is five. All the digits are significant.
There are 4 significant digits in 5600.