THE SGA IS SHARED MEMORY, UPDATED BY ALL SESSIONS; PGAS ARE PRIVATE TO EACH SESSION
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C and E. The SGA is shared memory, updated by all sessions; PGAs are
private to each session. The SGA is allocated at startup time (but it can be
modified later).
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A, B, and D. A is wrong because it reverses the situation: it is the SGA that
exists in shared memory, not the PGA. B is wrong because sessions write to
both their own PGA and to the SGA. D is wrong because (unlike the SGA) the
PGA is only allocated on demand.