Describe the transformation required to obtain the graph of the given function from the basic trigonometric graph. y = -7 sec x

a. Reflection across the y-axis and horizontal stretch by a factor of 7

b. Reflection across the x-axis and vertical translation up 7 units

c. Reflection across the x-axis and vertical stretch by a factor of 7

d. Reflection across the x-axis and horizontal stretch by a factor of 7

Please select the best answer from the choices provided