You act for the assignee of a registered lease. The freehold title is unregistered. Which of the following best describes the pre-completion searches which you should carry out? Your client is not taking a mortgage.
选项：

A: You should carry out a Land Charges search against your client
B: You should carry out a Land Charges search against the assignor and an OS1 priority search against the freehold
C: You should carry out a Land Charges search against the landlord
D: You should carry out a Land Charges search against the landlord and an OS1 priority search against the leasehold
E: You should carry out a Land Charges search against the landlord and the assignor