Question : Which one of the following is an application of Stack Data Structure ?1. managing function calls2. The Stock span problem

1. Break Down the Problem

We need to identify which of the provided options is a valid application of a Stack data structure. The options are:

1. Managing function calls
2. The Stock span problem

2. Relevant Concepts

A stack is a linear data structure that follows the Last In First Out (LIFO) principle. Key applications of stacks include:

• Function call management in programming languages (call stack).
• Various algorithms and problems, like evaluating expressions or processing nodes in graphs.

3. Analysis and Detail

1. Managing function calls:
   • In most programming languages, when a function is called, the current execution context is saved on a stack. When the function execution completes, the context is popped from the stack, resuming the previous function execution.
2. The Stock span problem:
   • This problem can be solved using a stack to efficiently calculate the number of days the stock price was less than or equal to the current day's price.

4. Verify and Summarize

Both options provided are indeed applications of stack data structures. However, managing function calls is a fundamental and primary usage, while the Stock span problem is a specific algorithmic application.

Final Answer

Both options are valid, but "managing function calls" is a primary application of the Stack data structure.