一个项目团队在周末对一个项目升级进行测试。客户指定的质量保证测试人员未能出席调试测试以及进行签署同意，测试人员和直线经理都联系不上，团队经常完成这些项目，并且经过大量测试后，确信该设施将在周一上午完美运行。项目经理应该怎么做？

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员

选择了： Keep the team on standby in case the tester can be reached before Monday morning. 让团队保持待命状态，以防万一在周一上午之前可以联系到测试人员

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员

选择了： Instruct a member of the client team to conduct the acceptance testing and sign-off in place of the appointed tester. 指示客户团队的一位成员代替指定的测试人员进行验收测试以及签署同意

选择了： Keep the team on standby in case the tester can be reached before Monday morning. 让团队保持待命状态，以防万一在周一上午之前可以联系到测试人员

选择了： Instruct the team to suspend the upgrade，and schedule an emergency review meeting with the project sponsor for Monday morning. 指示团队中止升级，并安排周一上午与项目发起人进行紧急评审会

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员

选择了： Follow the escalation process to obtain a tester authorized to sign off on the upgrade. 按照升级上报流程获得授权签署同意这项升级的测试人员