bridge mac sub layer

Question

Q. A System with redundant bridges might have a problem with _______________ in the systems.

    1). Loops                                                      2). Filters

    3). Spanning Trees                                     4). All the above.

Comments

1)

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Bridges avoids infinity loops by spanning tree algorithm

and 1 ) filtering  2) Flooding  etc is a properties of Bridges

but problem arise when there's a infinity loops

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what is filter?

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A bridge works by scanning the addresses of MAC level (Ethernet addresses) of the devices connected to each of its network interfaces and then forwarding the traffic between the two networks only if the source and the destination are on different segments.

The bridge filtering mechanism provides a way for the users to define rules to allow/deny frames through the bridge based on source MAC address, destination MAC address and/or frame type.