The glycinato anion, shown below, can act as a bidentate monoanionic ligand to a transition metal ion coordinating to th

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The glycinato anion, shown below, can act as a bidentate
monoanionic ligand to a transition metal ion coordinating to the
metal ion through the NH2 and the deprotonated
carboxylate ion.
Consider the glycinato complex
[Ru(NH2CH2COO)3].
Which ONE of the following statements
contains a complete description of the geometric and optical
isomers possible for this complex?
A.
The complex has two optical isomers, and it is possible to draw fac
(facial) and mer (meridional) isomers.
B.
The complex exists only as optical isomers.
C.
The complex exists only as fac (facial) and mer (meridional)
isomers.
D.
The complex has no optical isomers but does have cis and trans
isomers.
E.
The complex displays linkage isomerism, as well as optical
isomers.