Show the result of allocating the following blocks from a memory pool of size 1000 using worst fit for each series of block requests. State if a given request cannot be satisfied.

(a) Take 300 (call this block A), take 500, release A, take 200, take 300.

(b) Take 200 (call this block A), take 500, release A, take 200, take 300.

(c) Take 500 (call this block A), take 300, release A, take 300, take 200.