When using Table 3-10 of the Steel Manual to find the lightest W-shape to support required strength, Mu, over an unbraced length, Lb, you should locate the coordinate (Lb, Mu), then do which of the following? Group of answer choices Move up the chart to the next solid line Move up the chart to the next dashed line Move to the right on the chart to the next solid line Move to the right on the chart to the next dashed line