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Counters - Technical MCQs

Q1:

What is the maximum delay that can occur if four flip-flops are connected as a ripple counter and each flip-flop has propagation delays of tPHL = 22 ns and tPLH = 15 ns?

A 15 ns

B 22 ns

C 60 ns

D 88 ns

ANS:D - 88 ns

Please clarify that whether the ripple counter is synchronous or asynchronous.

Because when it is asynchronous then the total delay is 4*(tplh+tphl)/2 else it would be only (tplh+tphl)/2;