What BasePermission gives access to download a list item's file or attachments?

I have a Sharepoint list item that is a document type... or has file attachments. One or the other.

I call CSOM to get the permissions of a list item as shown here: https://sharepoint.stackexchange.com/questions/128715/getusereffectivepermissions-returns-wrong-results

The PermissionKind enum contains: 

        EmptyMask = 0,
        ViewListItems = 1,
        AddListItems = 2,
        EditListItems = 3,
        DeleteListItems = 4,
        ApproveItems = 5,
        OpenItems = 6,
        ViewVersions = 7,
        DeleteVersions = 8,
        CancelCheckout = 9,
        ManagePersonalViews = 10,
        ManageLists = 12,
        ViewFormPages = 13,
        AnonymousSearchAccessList = 14,
        Open = 17,
        ViewPages = 18,
        AddAndCustomizePages = 19,
        ApplyThemeAndBorder = 20,
        ApplyStyleSheets = 21,
        ViewUsageData = 22,
        CreateSSCSite = 23,
        ManageSubwebs = 24,
        CreateGroups = 25,
        ManagePermissions = 26,
        BrowseDirectories = 27,
        BrowseUserInfo = 28,
        AddDelPrivateWebParts = 29,
        UpdatePersonalWebParts = 30,
        ManageWeb = 31,
        AnonymousSearchAccessWebLists = 32,
        UseClientIntegration = 37,
        UseRemoteAPIs = 38,
        ManageAlerts = 39,
        CreateAlerts = 40,
        EditMyUserInfo = 41,
        EnumeratePermissions = 63,
        FullMask = 65

It seems to me the ones relevant to reading a file are:

ViewListItems
OpenItems
Open
ViewPages

Should I check for all 4 of these? What is the safe way to do this?