Consider a class that uses the following variables to implement an array-based stack:

Question

```
String [] s = new String[100];
int top = 0;

```

a method that implements the String peek() operation can be written as
A) return s[top];
B)
if (top == 0)
throw new RuntimeException("Underflow");
else
return s[top];
C)
if (top == 0)
throw new RuntimeException("Underflow");
else
return s[top-1];
D) return s[top-1];

Answer 1

C)
if (top == 0)
throw new RuntimeException("Underflow");
else
return s[top-1];