One of the methods that could have prevented the Yahoo data breach is , when a user is asked to enter information such as username and password, then a mobile app generates and sends a random number code for the user to enter before being granted access to his or her account.

Cprogram to find //perimeter of rectangle printf(" \n perimeter of rectangle \n"); printf(""); printf("\n enter width and length of the rectangle : "); scanf("%f%f", & width,& length); perimeter = 2 * (width + length); printf("perimeter of rectangle is: %.3f", perimeter);  

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