针对升序整数数组实现查找第一个大于等于target的元素下标，以下哪个代码可以正确完成需求？

ed460117 单选题共个子题

以下代码均使用Python语言实现，输入的nums为严格升序的整数数组，若所有元素都小于target则返回数组长度n：

def lower_bound(nums, target):
    left, right = 0, len(nums)-1
    while left <= right:
        mid = left + (right - left) // 2
        if nums[mid] >= target:
            right = mid
        else:
            left = mid + 1
    return left

def lower_bound(nums, target):
    left, right = 0, len(nums)
    while left < right:
        mid = left + (right - left) // 2
        if nums[mid] >= target:
            right = mid -1
        else:
            left = mid +1
    return left

def lower_bound(nums, target):
    left, right = 0, len(nums)-1
    while left < right:
        mid = left + (right - left) // 2
        if nums[mid] >= target:
            right = mid
        else:
            left = mid +1
    return left if nums[left] >= target else -1

def lower_bound(nums, target):
    left, right = 0, len(nums)
    mid = left + (right - left) // 2
    while left <= right:
        if nums[mid] >= target:
            right = mid -1
        else:
            left = mid +1
    return left

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