You work as an Exchange Administrator for Xxx Inc.The company has a Windows 2008 Active Directorybased network.The network contains an Exchange Server 2010 organization.There are 150 mailboxes in the messaging organization， which are stored in a mailbox database named MailboxDatabase.You have set the storage quota limit to 200 MB for all mailboxes in the database MailboxDatabase.When the limit of a mailbox reaches 180 MB， the corresponding user gets a warning message.After reaching the limit， the users are not able to send and receive any e-mail.The manager of your company， John Smith， asks you to change the storage limit for his mailbox to 280 MB. Which of the following commands will you enter in the Exchange Management Shell to accomplish the task？（）

A. Set-Mailbox -Identity john.smith@Xxx -IssueWarningQuota 188743680 - ProhibitSendReceiveQuota 293601280 -UseDatabaseQuotaDefaults $true
B. Set-Mailbox -Identity john.smith@Xxx -IssueWarningQuota 188743680 - ProhibitSendReceiveQuota 293601280 -UseDatabaseQuotaDefaults $false
C. Set-Mailbox -Identity john.smith@Xxx -IssueWarningQuota 188743680 - ProhibitSendReceiveQuota 293601280
D. Set-Mailbox -Identity john.smith@Xxx -IssueWarningQuota 188743680 -ProhibitSendQuota 293601280 -UseDatabaseQuotaDefaults $false