i want answers with explaination

Question.3. Channel 2 of the Programmable Interval Timer (PIT) is used to generate sound on computer's internal speaker. What unsigned value must be loaded in the counter register of PIT channel to have the lowest (The osclllator provides roughly 1193182Hz input to each channel of the PIT. Counter register of PIT channel contains 16 -bit non-signed positive value.) A. 1193182 B. 0001h C. OFFFFh D. 18 E. 55 ANSWER: Question 4. Video adapter is in the VGA graphics mode with 16 colors and 640480 pixels resolution, so four display lanes are used in the video memory. How many bytes are used in the video memory to store information about on orizontal line of 80 blue color pixels