I'd use only the first one. The present participle would be understood as dynamic, while the past participle (b) would most likely be taken as static. ) I use the terms naturally, not grammatically.
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AvangiRe the ambiguity in b) because of the passive vs. "to be" plus adj., it's just unavoidable with certain verbs. Adding "of which" doesn't seem to change it.
AvangiI just wrote a very long post, but I scrapped it.