Which Windows PowerShell cmdlet or cmdlets should you run?

You are a SharePoint administrator at Litware, Inc.
Excel Services is not currently able to load workbooks on the SharePoint site. The Unified
Logging Service (ULS) log contains the following error message:
System.Data.SqICIient.SqIException: Cannot open database
“WSS_Content_Portal_Content_Database” requested by the login. The login failed. Login
failed for user ‘LITWARE\svcExcelService’.
You need to grant only the minimum necessary permissions to the Excel Services account to
ensure that users can open Excel workbooks from within a browser window.
Which Windows PowerShell cmdlet or cmdlets should you run?

A.
$sa = Get-SPServiceApplication | where {$_.TypeName -eq “Excel Services Application
Web Service Application”} and
$sa.GrantContentDatabasePermissions(“WSS_Content_Portal_Content_Database”)

B.
Add SPShellAdmin -UserName LITWARE\svcExcelService

C.
Add SPShellAdmin -UserName LITWARE\svcExcelService -database
WSS_Content_Portal_Content_Database

D.
$wa = Get-SPWebApplication https://portal.litware.com and
$wa.GrantToProcessIdentity(“LITWARE \svcExcelService”)