Assume arr2 is declared as a two-dimensional array of integers. which of the following segments of code successfully calculates the sum of all elements arr2? int sum = 0; for(int j = 0; j < arr2.length; j++) { for(int k = 0; k < arr2[j].length; k++) { sum += arr2[k][j]; } } int sum = 0; for(int j = arr2.length − 1; j > = 0; j−−) { for(int k = 0; k < arr2[j].length; k++) { sum += arr2[j][k]; } } int sum = 0; for(int[] m : arr2) { for(int n : m) { sum += n; } }

Creating "smart interfaces" in all sectors of industry, government, and the public arena is one of the fastest growing hct areas. these interfaces model, interpret, and analyze such human characteristics as speech, gesture, and vision. the field of biometrics, in which humans authenticate themselves to machines, is an area of considerable interest to hct practitioners. fingerprint scans are one of the most frequently used biometric options, and this article, biometric student identification: practical solutions for accountability & security in schools, makes a case for the implementation of fingerprint scans in schools. critique the article, and answer the following questions: according to the author, what are the main benefits of adopting fingerprint scans in schools for student identification? according to the author, what are the main drawbacks of adopting fingerprint scans in schools for student identification? do you agree with the author's assessment of the pl