In a certain apartment building exactly 1/3rd of the apartments have two bedrooms and exactly 1/7th of the two bedroom apartments are front apartments. Which of the following could be the total number of apartments in the building?

In a certain apartment building exactly 1/3^rd of the apartments have two bedrooms and exactly 1/7^th of the two bedroom apartments are front apartments. Which of the following could be the total number of apartments in the building?