What do dynamic-link library (dll) files do?

a. send out error messages when the operating system finds an error it can’t recover from

b. provide operating systems with information about performing specific computing functions

.c save serial numbers and keys in order to avoid software installation issues

d. finds files that aren’t being used and then deletes them to create hard drive space

Which of the following is a difference between the systems development life cycle (sdlc) and extreme programming (xp)? the sdlc model has a separate planning and analysis phase, whereas xp combines both the phases into one phase. in the sdlc model, changes cannot be made to a system once it is delivered to the user, whereas the xp method delivers the system to the users and then make changes suggested by the user. the sdlc model develops an entire system at once, whereas xp uses incremental steps to improve an information system's qualitydevelopers following the sdlc model cannot go on to the next phase until the current phase is finished, whereas in xp, developers can move to any phase from the current phase.