In verilog, What are the recommended design used for blocking vs non blocking assignments. Select the right answers:

1)in a combinational block you should place the blocking statement at the top of the block and the non blocking assignments at the bottom of the block.

2) a continuous assignment statement can be either blocking or non blocking.

3) procedural assignments in a combinational block should all be blocking.

4) procedural assignments in a synchronous block should all be non blocking.