One reason allowing a user to change the desktop configuration poses a security problem is that to change a desktop the user must also be given rights to change other system settings

The Portable Apps platform is open source and the apps are free

Indicate whether the statement is true or false

One way to sparsify a proximity matrix is the following: For each object (row in the matrix), set all entries to 0 except for those corresponding to the objects k-nearest neighbors. However, the sparsified proximity matrix is typically not symmetric.

(a) If object a is among the k-nearest neighbors of object b, why is b not guaranteed to be among the k-nearest neighbors of a? (b) Suggest at least two approaches that could be used to make the sparsi- fied proximity matrix symmetric.