Consider a computer system with three users: alice, bob, candy. alice owns the file alicerc, and bob and cyndy can read it. cyndy can read and write the file bobrc, which bob owns, but alice can only read it. only cyndy can read and write the cile cyndyrc, which she owns. assume that the owner of each of these files can execute it.
a. create the corresponding access control matrix.
b. cyndy gives alice permission to read cyndyrc, and alice removes bob's ability to read alicerc. show the new access control matrix.

For all machines-not just hammers- the user applies force force to the machine to the machine over a certain distance. a. input b. output c. duo d. none of the above

What did i do wrong with this const discord = require('discord. js'); var bot = new discord. client(); const token = 'ntm3mjcxmtu1mjg3ote2ntq2.dyogew. dpfiwfpuifzuzvifop-csuxasnm' const prefix = "! " bot. registry. registergroup('simple', 'simple'); bot. registry. registerdefaults(); bot. registry. + '/commands'); bot. on('message', message => { if(message. content == 'hi! ') { message. channel. send ('@everyone sup, how is @everyone day going'); } if(message. content == 'h3lp') { message. channel. send ('dose not have any commands yet'); } bot. on('ready', function() { console. log("ready") }); bot. login(token);

The idea that, for each pair of devices v and w, there’s a strict dichotomy between being “in range” or “out of range” is a simplified abstraction. more accurately, there’s a power decay function f (·) that specifies, for a pair of devices at distance δ, the signal strength f(δ) that they’ll be able to achieve on their wireless connection. (we’ll assume that f (δ) decreases with increasing δ.) we might want to build this into our notion of back-up sets as follows: among the k devices in the back-up set of v, there should be at least one that can be reached with very high signal strength, at least one other that can be reached with moderately high signal strength, and so forth. more concretely, we have values p1 ≥ p2 ≥ . . ≥ pk, so that if the back-up set for v consists of devices at distances d1≤d2≤≤dk, thenweshouldhavef(dj)≥pj foreachj. give an algorithm that determines whether it is possible to choose a back-up set for each device subject to this more detailed condition, still requiring that no device should appear in the back-up set of more than b other devices. again, the algorithm should output the back-up sets themselves, provided they can be found.\