在升序排列的整数数组中查找第一个大于等于目标值target的元素下标（左边界），下列Python实现的二分查找代码中正确的是？

第28599题单选题

假设数组下标从0开始，忽略数组为空、target小于所有元素或大于所有元素等极端输入的验证，仅考查二分查找的边界处理逻辑。

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

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

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

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知识点：

算法实现-二分边界条件处理

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