Which two are valid constructors for Thread? 1 Thread(Runnable r, String name) 2 Thread() 3 Thread(int priority) 4 Thread(Runnable r, ThreadGroup g) 5 Thread(Runnable r, int priority)

(1) and (2) are both valid constructors for Thread.

(3), (4), and (5) are not legal Thread constructors, although (4) is close. If you reverse the arguments in (4), you'd have a valid constructor.