Вычислите \({\frac{56x^3y^4}{z^5}\cdot}{(-\frac{z^4}{16x^2y^6})}\) .

• \(-\frac{7x}{2y^2z}\)
• \(-\frac{7y^2z}{2x}\)
• \(\frac{7x}{2y^2z}\)
• \(\frac{7y^2z}{2x}\)