### Understanding DataFrames and Not NaN (notna) Method in PythonIn this exercise, we will explore how to use the `df.notna().sum()` function on a DataFrame to determine the non-missing values for each column.Consider the following DataFrame (df):| X | Y | Z ||-----|-----|-----|| 1 | NaN | 1 || 2 | NaN | 2 || NaN | 1 | 3 |#### Question:What will be the output for the following command?```pythondf.notna().sum()```#### Options:- **Option 1:** ``` 0 False 1 False 2 False Name: z, dtype: bool ```- **Option 2:** ``` x 2 y 1 z 3 ```- **Option 3:** ``` x True y True z False dtype: bool ```- **Option 4:** ``` Syntax Error ```#### Explanation:To determine the correct output, let’s understand what `df.notna().sum()` does:1. `df.notna()` creates a DataFrame of the same shape with boolean values indicating the presence (True) or absence (False) of non-missing values (NaN).2. `.sum()` then sums these boolean values along each column, where `True` is considered as 1 and `False` as 0.For the given DataFrame:``` X Y Z 1 NaN 1 2 NaN 2 NaN 1 3```- For column `X`: Two non-missing values (1 and 2) → sum is 2- For column `Y`: One non-missing value (1) → sum is 1- For column `Z`: Three non-missing values (1, 2, 3) → sum is 3Hence, the correct output of `df.notna().sum()` will be:```x 2y 1z 3```Thus, the correct option is **

The given data frame is - X Y Z 1 NaN 1 2 NaN 2 NaN 1 3 The given python command for…

For the following dataframe (df): Y 1 NaN 1 2 NaN NaN 1 3 What will be the output for the following command? df.notna().sum) 0 False 1 False 2 False Name: z, dtype: bool х 2 y 1 3 X True y True False dtype: bool Syntax Error

For the following dataframe (df): Y 1 NaN 1 2 NaN NaN 1 3 What will be the output for the following command? df.notna().sum) 0 False 1 False 2 False Name: z, dtype: bool х 2 y 1 3 X True y True False dtype: bool Syntax Error

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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