How does an enveloped virus gain/obtain/get its envelope?

The envelope is produced by the organelles in the host cell.

The envelope is produced by the DNA/RNA of the host cell.

The virus builds its envelope after it has been released from the host cell.

The envelope come from the host cell membrane as the virus leaves the host cell

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.