Goal: Joining the legs to seat

Which of the following methods is more reasonable for accomplishing this goal?
Join the legs with three 2-1/2-in. deck screws and construction adhesive. Pre-drill all the screw holes with a countersink bit to avoid splitting the wood. Finally, set the sides up parallel to each other and glue and screw one on the front and one on the back of seat at pre-marked designations ( front 1-1/2in from front edge back 1 -1/2in from back edge)