please help with these java questions

Which list of access specifiers is ordered from least restrictive to most restrictive? a) public, private, protected b) public, protected, private c) protected, public, private d) private, protected, public e) protected, private, public 2 Thing is a class, what must be true to allow TreeSet ts; to be legal? a) Thing must import TreeSet b) Thing must implement Comparable c) Thing must override hashcode d) TreeSet must import Thing e) Thing must inherit from TreeSet 3 Which of the following could be legal? a) class X extends B,C b) class X implements X c) class X extends B implements Object d) class X extends B implements D, E e) class X implements extends 4 Which of the following conversions would require an explicit cast? a) int- float b) long ? int c) float ? double d) char int e) byte int