Validate the two below statements $($True$/$False$)$ with brief justification:

a$)$ While designing a clock driven schedule for $3$ periodic tasks $(10,2),(15,4)$ and $(20,5),$ a designer selected the frame size as $4.$ Do you agree with the designer$$s choice regarding the frame size? Please provide one line justification for your answer.

b$)$ We can use hard$-$disks in RT systems If we can store files contiguously minimizing R$/$W Head movements. $[4]$