Lead low I like, high I dislike

Joy Bryant, an actress and former fashion model, said, "I kind of do high-low style a lot."

At the bridge table, defenders should do a lot of high and low to win style and scorecard points. When defenders use normal signals and discards, an unnecessarily high card is encouraging and the lowest card is discouraging. But when leading a suit, the opposite applies. A low card from length guarantees at least one honor in the suit and announces a desire to try to win tricks in that suit. But with a weak suit, one leads high.

How do those agreements apply in this deal? South is in three no-trump, and West is on lead.