Final answer:
The Heavy Forwarder can parse data before forwarding it. It is capable of performing processing functions such as indexing, filtering, and routing, unlike the Universal Forwarder, which is designed to forward raw data with minimal processing.
Step-by-step explanation:
The Heavy Forwarder is the type of forwarder that has the capability to parse data prior to forwarding it. A Heavy Forwarder can perform a variety of processing functions on the data it handles, such as indexing, filtering, and routing, before it sends the data on to another destination like a central indexer.
On the other hand, a Universal Forwarder is designed for efficiency and speed, it forwards raw data and has minimal processing capabilities. A Regular Forwarder is not a commonly used term within this context, but if it refers to a Heavy Forwarder, then it too can parse data. Lastly, an Indexer is primarily responsible for parsing and indexing incoming data, not for forwarding it. Therefore, among the given options, it's the Heavy Forwarder that has the capability to parse data prior to forwarding.