单选题When designing an expansion within the same data center, when is a pre-sales TDA absolutely required by IBM?（）A for a SAN768B DirectorB for a second TS3500 Tape LibraryC for a second EXP5060 Expansion UnitD for an additional DS8300 Expansion Frame
题目
单选题
When designing an expansion within the same data center, when is a pre-sales TDA absolutely required by IBM?（）
A
for a SAN768B Director
B
for a second TS3500 Tape Library
C
for a second EXP5060 Expansion Unit
D
for an additional DS8300 Expansion Frame