Java 8 Features - General Questions

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        long c = java.util.stream.Stream.of("a", "bb", "cc", "d").filter(s -> s.length() == 2).count();
        System.out.println(c);
    }
}

Which stream operation is terminal?

What is the output of the following program?

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Optional<String> o = Optional.empty();
        System.out.println(o.orElse("none"));
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println(java.util.stream.IntStream.rangeClosed(1, 5).reduce(1, (a, b) -> a * b));
    }
}

What does a stream's intermediate operation (such as filter or map) do until a terminal operation is called?