Which line of code is a shorter, more idiomatic version of the displayed snippet?
val len: Int = if (x != null) x.length else -1
val len: Int = if (x != null) x.length else -1A. val len = x?.let{x.len} else {-1}
B. val len = x!!.length ?: -1
C. val len:Int = (x != null)? x.length : -1
D. val len = x?.length ?: -1
Answer: Option D
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