Given the following procedures, with code segment instruction addresses given on each line in 4 byte hex... 00000000 main PROC
; ... Execution Point A
0000011C CALL doSomething
00000120 MOV result, EAX
; ...
0000023E exit
0000023F main ENDP

0000023F checkThings PROC
; ...
00000243 XOR BX, 0A00h
; Execution Point B
; ...
00000274 RET
00000275 checkThings ENDP

00000275 doSomething PROC
; ...
000002A0 CALL checkThings
000002A5 MOV EAX, EDX
; ...
000002F3 RET
000002F4 doSomething ENDP
Assume there are no stack operations other than the shown CALL and RET instructions, and ESP = 00000900h at Execution Point A. At Execution Point B:

Required:
a. What is the current value of the stack pointer (in 4 byte hex)?
b. What is the value at the top of the stack (in 4 byte hex)?