Which of the following are true about deductions on the estate tax return?

Which of the following are true about deductions on the estate tax return? 

Check all that apply. 

The charitable deduction is unlimited, assuming qualifications are met.

Charitable contributions made through the estate are limited to 60% of estate income.

Making charitable contributions through the estate can be an important tax planning topic for clients with a taxable estate.  

The unlimited marital deduction refers to the amount left to the surviving spouse.