已知数列{a_n}成等比数列，且a_n＞０．

（1）若a₂－a₁=8，a₃=m．

①当m=48时，求数列{a_n}的通项公式；

②若数列{a_n}是唯一的，求m的值；

（2）若a_2k＋a_2k－1＋ ＋a_k＋1－ (a_k＋a_k－1＋ ＋a₁ )＝8，k∈N*，求a_2k＋1＋a_2k＋2＋ ＋a_3k的最小值．

Performing（）involves monitoring specific project results to determine if they comply with relevant quality standards and identifying ways to eliminate causes of unsatisfactory results.

A．quality planning

B．quality assurance

C．quality performance

D．quality control