Analyze the following recursive method and indicate which of the following will be true.

public static long factorial(int n)
{ return n * factorial(n - 1); }

a) The method runs infinitely and causes a StackOverflowError.
b) Invoking factorial(2) returns 2.
c) Invoking factorial(1) returns 1.
d) Invoking factorial(0) returns 0.

a) The method runs infinitely and causes a StackOverflowError.

// Return the factorial for a specified index

public static long factorial(int n)

{

if (n == 0)

return 1;

else

return n * factorial(n - 1);

}

b) Invoking factorial(2) returns 2.

// Return the factorial (2)

public static long factorial(int 2)

{

if (n == 2)

return 2;

else

return 2 * factorial(3 - 1);

}

c) Invoking factorial(1) returns 1.

// Return the factorial(1)

public static long factorial(int 1)

{

if (n == 1)

return 1;

else

return 1 * factorial(1 - 1);

}

d) Invoking factorial(0) returns 0.

// Return the factorial(0)

public static long factorial(int 0)

{

if (n == 0)

return 0;

else

return 0 * factorial(0 - 1);

}

Explanation: