IGMPv2 query processing by a v1 stack

Hello,

An IGMPv1 stack has joined groups G1, G2 and G3 and it has received an
IGMPv2 group (G1) specific query where none of the groups is "all
hosts group". I can think of following possibilities as how the stack
can handle the Query:

1. Process it as an IGMPv1 general query

As per RFC 1112 (pages 11, 12)
"
Group Address
In a Host Membership Query message, the group address field is zeroed
when sent, ignored when received. (B)
"

So the IGMPv2 Query packet is treated as a general query and reports
for ALL groups are sent.

Cons: Groups (G2, G3) that are not queried are being reported.

2. Send report for only group G1

Cons: any?

3. Drop it

Cons: Router/ snooping switch cannot refresh its forwarding state for
group G1 though sending a periodic v2 general query would do so.

I'm tempted to go for the 3rd option. What to you think?

-Subrata