Upgrade sequencying from 2012 SP1 to 2012 R2

Hi,

The scenario is the following:

SCOM 2012 SP1

SCCM 2012 R2

SCVMM 2012 SP1

I don't know what was the installation chronological order of above products.

The client need to upgrade SCVMM(to R2).

This article https://technet.microsoft.com/en-us/library/dn521010.aspx is about the upgrade sequencying for SC 2012 R2. It states that prior to upgrade SCVMM, first upgrade SCOM and SCCM.

The client has no budget to upgrade SCOM and SCCM first.

The questions are:

SCOM and SCCM must be upgraded first and then upgrade SCVMM?

or

SCOM and SCCM should be upgraded first and then upgrade SCVMM?

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What happen with SCOM/SCCM/SCVMM if SCVMM is upgraded first?

Thanks in advance!