A man travelling onf(x, y) = sin(xy). His shadow passing through the origin in a straight line (sun travels with him overhead).What is the slope of the line travelling on which would lead him to the lowest elevation.

• A. There isn’t such a line
• B. 1
• C. -1
• D. .What is the slope of the line travelling on which would lead him to the lowest elevation.a) There isn’t such a lineb) 1c)-1d) 0