Classify each of the following as an example of a mandatory, discretionary, or originator controlled policy, or a combination thereof. justify your answers.
a. the file access control mechanisms of the unix operating system.
b. a system in which no memorandum can be distributed without the author's consent.
c. a military facility in which only generals can enter a particular room.

In a heat transfer course, we can derive the equation for the temperature distribution in a flat rectangular plate. in this example, we will look at a plate at steadystate with three sides being held at t1, and one side held at t2. the temperature for any location on the plate, t(x,y), can be calculated by where create a function (prob3_5) that will take inputs of vectors x and y in feet, scalar n, scalars l and w in feet and scalars t1 and t2 in degrees fahrenheit. it will output a matrix t which is the temperature of each x and y locations. t will have the number of columns equal to the number of elements in x and rows equal to the number of elements in y. though this can be done without loops (perhaps more efficiently), your program must use a nested loop.