networking experts or systems administrators ,database administrators,programmers.
Explanation:
The people who enter in the field of information security are professionals in technical fields bu their work is totally into the field of security like working on security applications.They don't work on the traditional IT assignments such as developing software,apps,website etc.
In the code given in the question phones dictionary contains contains two keys John and Julie and have the values '5555555' and '7777777' respectively. Now in the code the key John in the dictionary phones is assigned the value '1234567' .So the value corresponding to the key John becomes '1234567'.
The line which appears when we are dragging an object of GUI on a object of windows Form indicates that the object that is being dragged is aligned horizontally with the object which is connected by the blue line is called a snap line.
Hence we conclude that the answer to this question is snap line.
