B is the right option. As mentioned on Splunk Cloud Administration slide-deck, slide 135:
Universal Forwarders
Designed to run on production servers (minimal CPU / memory use, bandwidth constrained to 256 KBps by default, no web interface, cannot search or index)
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Nastenka
3 days, 5 hours agoA10D21
4 months, 2 weeks agoAlcatelCR
4 months, 3 weeks ago