I need help with 45 to 48.

41. Consider a file whose size varies betw will be the least appropriate? een 1KB and 8MB during its lifetime. Which of the following allocation schemes a. Contiguous b. Linkecd c. Table/Indexed d. None of them 42. In which of the following I/O software layer is the "writing commands to the device registers" done a. Device-independent software b. Device driver c. User-level software d. Interrupts 43. Which type of errors that RAID level 3 can correct using only one parity drive? a. single-bit errors b. double-bits errors c. three-bits errors d. none of above 44. Which of the following ways is NOT one of the three fundamental ways that I/O can be performed? a. Programmed i/O b. Interrupt-driven I/O c. Memory-Mapped I/O d. I/O using DMA 45. Consider the following piece of C code. How many child processes are created upon execution of this program? void main) I fork( fork) exit() b. 3 C. 4 d. 5 46. The most important issue in implementing file storage is keeping track of which disk blocks go with which file. Select all applicable methods that are implemented in operating systems for the tracking purpose. a. Contiguous Allocation b. Linked-list Allocation c. I-nodes d. Table in Memory 47. Consider a file whose size varies between 1KB and 8MB during its lifetime. Which of the following allocation schemes will be the least appropriate? a. Contiguous b. Linked c. Table/Indexed d. None of them 48. Which following is the correct abstract sequence of events required to use a resource? a. Request the resource, use the resource, and release the resource. b. Lock the resource, use the resource, and unlock the resource. c. Use the resource, and release the resource d. Allocate the resource, lock the resource, use the resource, and unlock the resource