When plug prongs are connected to the metal case of an appliance, a part that should always be placed next to the case is a
a. hexagonal aluminum shoulder.
b. mica washer.
c. flat metal washer.
d. steel nut.

Afile named data.txt contains an unknown number of lines, each consisting of a single integer. write some code that creates two files, dataplus.txt and dataminus.txt, and copies all the lines of data1.txt that have positive integers to dataplus.txt, and all the lines of data1.txt that have negative integers to dataminus.txt. zeros are not copied anywhere.