context.WithTimeout

What will be printed when the code below is executed?

package main
import (
    "context"
    "fmt"
    "time"
)
func main() {
    timeout := 3 * time.Second
    ctx, cancel := context.WithTimeout(context.Background(), timeout)
    defer cancel()
    select {
    case <-time.After(1 * time.Second):
        fmt.Println("waited for 1 sec")
    case <-time.After(2 * time.Second):
        fmt.Println("waited for 2 sec")
    case <-time.After(3 * time.Second):
        fmt.Println("waited for 3 sec")
    case <-ctx.Done():
        fmt.Println(ctx.Err())
    }
}

Answer

waited for 1 sec