What is the approximate mass of the object Sagittarius A-star in solar masses?

W) 4 x 10 to the 2\({}^{\rm nd}\) power

X) 4 x 10 to the 6\({}^{\rm th}\) power

Y) 4 x 10 to the 10\({}^{\rm th}\) power

Z) 4 x 10 to the 16\({}^{\rm th}\) power
X) 4 x 10 to the 6\({}^{\rm th}\) POWER