If in some year real gdp was $5 trillion and the gdp deflator was 200, what was nominal gdp?

Real GDP = $5 trillion
GDP deflator = 200
The nominal GDP is $10 trillion.

Real GDP is the output effected by price. GDP deflator is the measure of the level prices of the new, local products produced, final goods and services within the economy. The nominal GDP is the current market prices.

Either a or d. not positive on which one though